Positive commandment · Mitzvat Aseh #64 of 613
The sin offering
מעשה חטאת
The verse · Vayikra 6:18
דַּבֵּר אֶל־אַהֲרֹן וְאֶל־בָּנָיו לֵאמֹר זֹאת תּוֹרַת הַחַטָּאת בִּמְקוֹם אֲשֶׁר תִּשָּׁחֵט הָעֹלָה תִּשָּׁחֵט הַחַטָּאת לִפְנֵי ה׳ קֹדֶשׁ קׇדָשִׁים הִוא
“Speak to Aharon and to his sons, saying, This is the Tora of the sin offering: In the place where the burnt offering is killed shall the sin offering be killed before the Lord: it is most holy.”
The Rambam’s words
The sin offering, as [Leviticus 6:18] states: "These are the laws of the sin offering...."
מעשה חטאת, שנאמר: "זֹאת תּוֹרַת הַחַטָּאת" (ויקרא ו, יח).
Who & when
“And it is practiced at the time of the [Temple] by the males of the priesthood.”
Where in the Mishneh Torah
Hilchot Sacrificial Procedure הלכות מעשה הקרבנות