Negative commandment · Lo Ta’aseh #185 of 613
Not to partake of [hard] fat
שלא לאכול חלב
The verse · Vayikra 7:23
דַּבֵּר אֶל־בְּנֵי יִשְׂרָאֵל לֵאמֹר כׇּל־חֵלֶב שׁוֹר וְכֶשֶׂב וָעֵז לֹא תֹאכֵלוּ
“Speak to the children of Yisra᾽el, saying, You shall eat no manner of fat, of ox, or of sheep, or of goat.”
The Rambam’s words
Not to partake of [hard] fat, as [Leviticus 7:23] states: "Do not eat any of the fat in an ox, sheep, or goat."
שלא לאכול חלב, שנאמר "כל חלב שור וכשב, ועז--לא תאכלו" (ויקרא ז,כג).
Who & when
“And it is practiced in every place and at all times by males and females.”
Where in the Mishneh Torah
Hilchot Forbidden Foods הלכות מאכלות אסורות