Sefer HaMitzvot, Negative Commandments
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הזהיר מאכול גיד הנשה, והוא אמרו על כן לא יאכלו בני ישראל את גיד הנשה, ומי שאכלו כלו לוקה ואפילו היה קטן מאד או שאכל ממנו כזית. וכבר התבארו משפטי מצוה זו בפרק ז' מחולין. (וישלח יעקב, שם פ"ו):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited [us] from eating the sciatic nerve. And that is His saying, "Therefore, the Children of Israel do not eat the sciatic nerve" (Genesis 32:33). And one who ate all of it - even if it was very small - or ate a kazayit of it is lashed. And the regulations of this commandment have already been explained in Chapter 7 of Chullin. (See Parashat Vayishlach; Mishneh Torah, Forbidden Foods 6.)