Positive commandment · Mitzvat Aseh #90 of 613
To burn sacred meat which became impure
לשרוף בשר קודש שנטמא
The verse · Vayikra 7:19
וְהַבָּשָׂר אֲשֶׁר־יִגַּע בְּכׇל־טָמֵא לֹא יֵאָכֵל בָּאֵשׁ יִשָּׂרֵף וְהַבָּשָׂר כׇּל־טָהוֹר יֹאכַל בָּשָׂר
“And the flesh that touches any unclean thing shall not be eaten; it shall be burnt with fire: and as for the flesh, all that are clean shall eat of it.”
The Rambam’s words
To burn sacred meat which became impure, as [Leviticus 7:19] states: "And the flesh which touches anything impure... [shall be burnt]."
לשרוף בשר קודש שנטמא, שנאמר: "והבשר אשר ייגע בכל טמא" (ויקרא ז,יט).
Why · Sefer HaChinuch #146
Burning meat of sacrifices that has become impure
“It is from the roots of the commandment [that it is] since the nature of all meat is (to spoil) [to become disqualified] by sitting out and coming to (putrification) [loss].”
Who & when
“And the burning of [sacrifices] that became impure is practiced at the time of the [Temple] by priests and by Israelites.”
Where in the Mishneh Torah
Hilchot Sacrifices Rendered Unfit הלכות פסולי המוקדשין