Halacha2goThe one minute halacha

Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.

Ground Rules for Scouring a Knife

One method to halachically purge a knife is neitzah b’karka eser pe’amim (sticking its blade into the ground ten times). This method may be used, for example, when the only knife available to cut bread for a milchig (dairy) meal is a fleishig (meat) knife. The rule is: stam sakin shamnuniso karush alav (the typical knife has [a film of meat] fat congealed on it). The knife is required to be thoroughly clean, so breaking through karka kashah (hard earth) with its blade ten times—each time in a different spot—will scour it sufficiently.

There is discussion among poskim of the exact definition of karka kashah—too hard or too soft would not properly cleanse the knife. Some authorities therefore suggest avoiding this process, since it is difficult to know if we are fulfilling it properly.

In an age of abrasive cleansers, steel wool and other methods of removing a film of fat from utensils, some contemporary poskim maintain that a knife that is cleaned well is equivalent to neitzah b’karka.

However, there are additional uses for neitzah b’karka mentioned in halachah, for example: to use a treif (non-kosher) knife to cut something kosher and cold, even sharp foodstuffs—in a pinch.* By piercing the knife through unyielding earth the treif that was absorbed right under the surface of the blade is expelled; a good scrub (which only removes surface matter) may not suffice. To permit use of the knife, it must be stuck into ground that fills the conditions of neitzah b’karka kashah, or alternatively, go through proper kashering.

*It should be noted that a treif knife requires kashering if it is to be used regularly (or even once for hot food); in these cases, neitzah b’karka does not suffice.

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383 When Can Holy Items Be Used for Mundane Purposes?

382 Reciting Tehillim מ״מ

381 What Does the Mitzvah of Teshuvah Entail? מ״מ

380 Which Liquids are Acceptable for Netilas Yadayim? מ״מ

379 Lo Tisgodedu: Conflicting Rulings in One Community מ״מ

378 What Mikvah is Kosher for Men? מ״מ

377 Reciting Tefillas Haderech for Others מ״מ

376 Panim Chadashos and the Minyan for Sheva Brachos מ״מ

375 Playing Ball in a Park on Shabbos מ״מ

374 Privacy in the Back Yard מ״מ

373 Visiting Kivrei Tzadikim

372 Beverages for Kiddush: Order of Priority מ״מ

371 Helping Childless Couples מ״מ

370 Father-in-law and Son-In-in Law Sharing Names מ״מ

369 Can a Non-Jew Light Shabbos Candles for Me? מ״מ

368 How Much Bread Requires Washing with a Brachah? מ״מ

367 Kashering a Microwave מ״מ

366 Laws of Nursing מ״מ

365 Six Hour Waiting Period for Sharp Foods מ״מ

364 Tisha B'Av After Chatzos

363 Exercise on Shabbos

362 Building the Beis Hamikdash

361 Microscopic Reality in Halachah

360 Talking while Eating

359 Toiveling Electric Dishes

358 The Early Minchah

357 Fake Money on Shabbos

356 Children as Shomrim for Yichud

355 OCD in Halachah

354 Changing Diapers in front of Sefarim מ״מ

353 The Brachah on Sushi

352 The Rule of Shtei Kedeiros (Two Pots) מ״מ

351 How to Recite Kabbolas Shabbos מ״מ

350 Motioning during Davening מ״מ

349 Supporting Torah vs. Buying a Sefer Torah מ״מ

348 Kashrus of Battim מ״מ

347 Payment for a Mohel מ״מ

346 Behavior on a Fast Day מ״מ

345 Tosefes Shabbos (Adding to Shabbos): Mentally or Verbally? מ״מ

344 Zecher L'Churban (Remembering the Destruction of the Beis Hamikdash) when Renovating מ״מ

343 Interest Accrued in Savings Account over Shabbos מ״מ

342 The Parameters of Adopting a Chumrah (Stringency) מ״מ

341 Mesiras Nefesh (Self Sacrifice) Beyond the Law מ״מ

340 Bar Metzra (The Neighbor's Right) when Purchasing Property from a Non-Jew מ״מ

339 Potatoes Added to Cholent before Shabbos מ״מ

338 Accessing the Car Trunk on Shabbos מ״מ

337 Acceptance and Expulsion Policies in Schools מ״מ

336 Activities Forbidden Before Davening מ״מ

335 Kiddush in the Presence of Women's Hair מ״מ

334 Genizah (Kosher Burial) for Accessories of Seforim (Holy Books) מ״מ

333 The Mitzvah of Cleaving to Tzadikim מ״מ

332 Changing Locations when Eating מ״מ

331 When Wine used at a Chuppah needs to be Replaced מ״מ

330 Testing Children Who are Unprepared מ״מ

329 When to Recite Hagomel מ״מ

328 May Neighbors Object to a Playgroup? מ״מ

327 Muktzah with a Holy Coin מ״מ

326 May I call my Son Avremil? מ״מ

325 Mikvah for Intermarried Women מ״מ

324 Brachah on the Remaining Tofel (Secondary Food) מ״מ

323 Drinking in the Shower מ״מ

322 The Yud Knot of Tefillin מ״מ

321 Shabbos at a Hotel מ״מ

320 Pronouncing Hashem's Name when Saying L'shem Yichud מ״מ

319 Is a Toy'en an Acceptable Profession? מ״מ

318 When Challah is Separated from Afar מ״מ

317 Hatoras Nedarim over the Phone מ״מ

316 Harei At... Under the Chuppah מ״מ

315 Maftir to Someone Who Has Difficulty Reading מ״מ

314 Mezuzah: Buying after Renting מ״מ

313 Cooked by a Mechalel Shabbos מ״מ

312 Kiddush Levana on a Cloudy Day מ״מ

311 Sheva Brachos during Seudah Shlishis מ״מ

310 What to Disclose to a Prospective Shidduch?

309 Pet Birds in Halachah

308 Mikvah for Men before Davening

307 Washing after Blood Tests

306 Answering Theoretical Questions regarding Financial Disputes

305 Separating Challah Again and Again

304 Preference for a Levi מ״מ

303 Sitting on Tombstones

302 How to Reach a Conclusion When Poskim Differ?

301 Order of Priority After Losing your Turn מ״מ

300 Mezuzah for Home Owned by Jew and Non Jew מ״מ

299 Havdalah for Women מ״מ

298 Oneness of Hashem מ״מ

297 How to Daven on an Airplane? מ״מ

296 At a Pidyon Haben ceremony (the redemption of a firstborn son), the baby�s father is asked, as per the text in the Siddur, whether he prefers מ״מ

295 Kissing Kids in Shul מ״מ

294 Yored: Paying for an Job I Never Asked For מ״מ

293 Unpleasant Muktzah in the Dining Room מ״מ

292 Definition of Shok: What needs to be Covered? מ״מ

291 Pizza without a Kashrus Seal מ״מ

290 Favors to Lender מ״מ

289 Bishul Akum with Sardines מ״מ

288 Kosher Switch or Shabbos App Are the Permissible? מ״מ

287 Eating before Kiddush

286 �Baked after Pesach�: Is it Relevant? מ״מ

285 Not Interrupting Between Mayim Acharonim and Benching מ״מ

284 Demonstrating Respect for Sefarim מ״מ

283 Eating the Edge of a Challah מ״מ

282 Must I let a Kohen go before me on the Line? מ״מ

281 Attitude to Tzedakah מ״מ

280 Anticipating the Coming of Moshiach מ״מ

279 Trying on A Suit not Checked for Shaatnez מ״מ

278 Parameters of Not Being a Nosheh (Harassing a Borrower) מ״מ

277 Berachah on New Trees

276 Shehecheyanu on Grafted Fruits מ״מ

275 Preparations for a Shabbos Seder

274 Safeguarding Chometz after the Bedikah

273 Fast of the Firstborn

272 Birthday Celebrations מ״מ

271 Kashering Braces or Dentures

270 Bedikas Chometz when Traveling for Pesach

269 Renting Property to Non-Jews

268 Qualifications for a Shochet

267 Collecting Tzedakah During Davening

266 Teacher who Lost Students Computer

265 Lashon Hara about Oneself מ״מ

264 Cellphones During Davening מ״מ

263 Electric Shabbos Candles מ״מ

262 Selling Olam Haba מ״מ

261 Standing During Chazoras Hashatz מ״מ

260 Are Torah MP3's Considered Learning Torah מ״מ

259 Talking Torah After Nail Cutting מ״מ

258 Mesirah Regarding Abuse מ״מ

257 Pi Tikrah - Roofs Extending Out מ״מ

256 When Negel Vasser Isn't Available מ״מ

255 Frivolous Contracts with Employees מ״מ

254 Removing Door that has a Mezuzah מ״מ

253 Marrying Two Wives מ״מ

252 Yibbum Vs. Chalitzah מ״מ

251 Lego on Shabbos מ״מ

250 Matnos Laevyonim מ״מ

249 Prenuptial Agreements מ״מ

248 Using Someones Tefillin מ״מ

247 Knock Before Entering מ״מ

246 Building a Mikvah מ״מ

245 Cursing מ״מ

244 Feeding Animals First מ״מ

243 Men Growing Long Hair מ״מ

242 Safeguarding the Kesubah מ״מ

241 Interest on a Credit Card מ״מ

240 How to Choose a Sofer? מ״מ

239 Covering the Chest מ״מ

238 Who Deserves Child Custody? מ״מ

237 Position During Tachanun מ״מ

236 A Will According to Torah מ״מ

235 How Much is a Kezayis? מ״מ

234 Torah in Bathroom or Bath House מ״מ

233 Snow on Shabbos מ״מ

232 Negiyah between Relatives מ״מ

231 Separating Challah at a �Challah Bake�� מ״מ

230 Who Qualifies as Mesader Kiddushin? מ״מ

229 Food Touched without Negel Vasser מ״מ

228 When & How Much to Sleep? מ״מ

227 Raffle on Shabbos מ״מ

226 Simchas Chasan V'Kallah מ״מ

225 Fruit Order of Preference מ״מ

224 Trusting a Mechalel Shabbos

223 Payment for Canceling Appointments

222 Behavior During Pregnancy

221 Who May Say Kaddish Yasom?

220 Reciting the Shira Daily

219 Extra Soda Can from the Machine

218 Shoveling Snow

217 Davening for Women

216 Shadchanus Gelt

215 Baby Wipes on Shabbos

214 Tznius: Long Loose Hair or Shaitlach מ״מ

213 Melachah on Rosh Chodesh

212 Issues with Non-Jewish Cleaning Help

211 Beriya: a Berachah Acharonah when Eating Less than a Kezayis

210 How to Choose a Mohel?

209 Lifnei Iver when Inviting Guests for Shabbos

208 Learning Halacha Before Anything Else

207 Talking in the Restroom

206 Pension for Senior Employees

205 Disposing of Shaimos which Were Not Used

204 Disposing of Separated Challah

203 Using a Child for Tevilas Keilim מ״מ

202 Coming Early to Shul

201 Proper Walking

200 Wedding Expenses from Maaser Money מ״מ

199 Shecheyanu on New Fruit

198 Gloves on Shabbos מ״מ

197 Blessing on Wine During a meal

196 Preparation for Prayer

195 Hesach Hadaas when Wearing Tefillin

194 Wine Touched by Non-Jews

193 Kiddush Levana Outdoors

192 Splurging on Wedding Expenses

191 Opening Cans on Shabbos

190 Carrying Tefillin Respectfully

189 Crackers: Hamotzie or Mezonos?

188 Elokai Neshama when Waking Up Twice

187 Mikvah at Private Home

186 Sitting near Someone Praying

185 When to light Menorah on Friday

184 Tzitzis when Sleeping

183 Time of Menorah Lighting

182 Where to Light the Menorah

181 Hesach Hadaas from Eating

180 Non Kosher Pills

179 Carrying a Child Holding Muktzah

178 Six Constant Mitzvos

177 Promising Gifts to a Child

176 Chazan Who Makes Mistakes

175 Preparing the Table for Benching

174 Blessing on Lighting and Thunder מ״מ

173 Early Maariv

172 Praying for Rain

171 Planting Memorial Trees

170 Language of Tombstones

169 Dimensions of Rooms for Mezuzah

168 Beverages Uncovered Overnight מ״מ

167 Medication on Shabbos

166 Timing of Blessing on Tallis

165 Changing to Alternative Medicine

164 Rewashing During a Meal

163 Kosher Conversions

162 Hallel with a Minyan

161 Clapping Hands on Shabbos

160 Dough with Non-Sweet Filling

159 Men Separating Challah

158 Soaking is like Cooking

157 When to Remove Tefillin?

156 Doubts in Davening

155 How to Comfort Mourners?

154 Raising a Hand to another

153 Rebuking One's Spouse

152 Bal Tashchis of Clothing

151 If One Errs and Puts on Rabbeinu Tam Tefilin Instead of Rashi�

150 Answering Omen Y'hei Shemai Rabbah

149 Tablecloth on Fire - Shabbos

148 Halachos of a Chupah

146 Work Given to a Kablan over Shabbos

145 Hair Covering for Women

144 Coffee or Tea for Havdalah

143 The Correct Attitude to Converts

142 Playing Monopoly

141 Correct Spelling of Names�

140 Spousal Obligations

139 Redeeming your Donkey

138 Cleaning Help on Shabbos

137 Washing Dishes on Shabbos

136 Gifts to the Kohen

135 May We Eat Sandwiches?

134 Images of Sun & Moon

133 Mezuzah When Moving

132 Ashuris Font

131 Extended Video: Chol Hamoed

130 Lulav for Children

129 Visiting Friends in their Sukkah

128 The First Night of Sukkos

127 Preparing Food for After Yom Kippur

125 Kashrus in the Holy Land - Shmitta

124 Protecting Our Thoughts

123 Hamelech Hakodosh

121 Eruv Tavshilin

120 Debt Cancellation & Pruzbul

119 Laws of Shofar

118 When Not to Forgive?

117 Ripping on Shabbos

116 Waking Up Parents

115 Men & Women Interaction at Work

114 Sanctity of Shemitta Produce

113 Adding Hot Water to a Cholent

112 Whistling / Blowing Out Candles מ״מ

111 Correct Beracha on Mixture of Foods II

110 Correct Beracha on Mixture of Foods I

109 Is It OK to Say Thank G-d? מ״מ

108 Washing for a Meal After Restroom

107 Kissing the Mezuzah

106 Who Gets Priority to Lead the Davening at Omud on a Yahrtzeit?

105 Delivering Not Good News

104 Shabbos: Tags on Clothing

103 Brochos�What to Have in Mind II�

102 Brochos�What to Have in Mind I�

101 Kiddush Wine Distribution

100 Sharing a Mezuzah with a Non-Jew�

99 Reading on Shabbos

98 A clean cup for Kiddush

97 Mid night Wake up

96 Return Policy (Follow Up to #68)

95 Baking Challah on Erev Shsbbos

92 Spilling Wine

91 Bar and Bas mitzvah

90 Times for Shacharis II

89 Times for Shacharis

88 Having a Dog at Home

87 Folding Tallis

85 Shma on time

81 Going to Court

80 A Kosher Mikvah

79 Price inquiries

78 Milk and Meat for Babies

77 Mishum Sakono

75 Gifts on Shabbos מ״מ

74 Bishul Goyim

73 How Foods Combine for Brochos

72 (70) The Mitzvah of Kiddush II

71 Kavonos when Saying Hashem�s Name

70 (69) Buying and Giving Presents during the Nine Days

69 (72) Bentching in the Home of a Gentile

68 68 Return Policy - Buying & Returning

67 Mezuza with a Brocho

66 Coffee shop - Does a coffee shop need a Hechsher?

65 Doing his job

62 Is Yoga Kosher?

61 Making Enough Brochos?

60 Pictures of Women

59 Pidyon Shvuim for a Thief

58 Is the Fruit Orla?

57 Burial of Placenta מ״מ

56 Tuition paid from Maaser money

55 Can a woman be home alone with a male worker?

54 Mezonos Part 2 מ״מNo text

53 Mezonos Part 1 No text

52 Bargaining No text

51 Say Bli Neder Before Doing No text

50 Combing Hair on Shabbos No text

49 Baking in a Fleishige Oven No text

48 Collecting Tzedakah vs. Working No text

47 Heads or Tails: Permissible? No text

46 Kidush 6-7 No text

45 Haircuts or Upsherin on Rosh Chodesh No text

44 Types of Mezonos No text

43 Brochos No text

42 Mechitza No text

41 Washing before eating No text

40 Tzedoko - How to Pledge Properly?

39 Tefilin No text

38 Taxi No text

37 Hamapil No text

36 Sick No text

35 Stain No text

34 Thoroughfare No text

33 Sharp food No text

32 Shehecheyanu No text

31 Health and Shabbos No text

30 Separate seating No text

29 Bais hachayim No text

28 Kovod for bread No text

27 Shavuos No text

26 Keeping what you found No text

25 Shloishes yemei hagbalah

23 Hashovas avaidah

22 Girls in men shull

21 fruit from Israel

20 Shabbos candles

19 Fish and Meat

16 Benching where you ate

12 Tvilas Keilim Myth

8 Can I check my Tzitzis on Shabbos?

7 Does Halacha let you speed?

6 Is a Sefer as a Shtender ok?

5 Can I pay tomorrow?

4 Must I wait six hours?

3 Should I call him Shver?

2 To whom must I give Tzedoko?

1 Can a Non-Jew do it on Shabbos?

Link to all Publications מראי מקומות

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Halacha #722: Ground Rules for Scouring a Knife

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