Sefer HaMitzvot, Negative Commandments
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הזהירנו מהבדיל ראש חטאת העוף בשעת מליקה. והוא אמרו יתעלה ומלק את ראשו ולא יבדיל ואם הבדיל פסל. והתבארו משפטי מצוה זו במסכת זבחים. (ויקרא, הלכות מעשה הקרבנות פ"ב):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from severing the head of the fowl sin-offering at the time of nipping (melikah). And that is His, may He be exalted, saying, "and he shall nip its head [...], and not sever it" (Leviticus 5:8). And the regulations of this commandment have been explained in Tractate Zevachim. (See Parashat Vayikra; Mishneh Torah, Sacrificial Procedure 2.)