Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 138

שלא תיאכל מנחת כוהן, שנאמר "וכל מנחת כוהן כליל תהיה, לא תיאכל" (ויקרא ו,טז).

For a meal offering brought by a priest not to be eaten, as [Leviticus 6:16] states: "Any meal offering brought by a priest shall be consumed entirely [by fire]; it shall not be eaten."