Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 90
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 90, with English translation by Maimonides (Rambam).
לשרוף בשר קודש שנטמא, שנאמר: "והבשר אשר ייגע בכל טמא" (ויקרא ז,יט).
To burn sacred meat which became impure, as [Leviticus 7:19] states: "And the flesh which touches anything impure... [shall be burnt]."