Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 89

לאכול בשר חטאת ואשם, שנאמר: "ואכלו אותם אשר כופר בהם" (שמות כט,לג).

To eat the flesh of the sin and guilt offerings, the Rambam includes eating other sacrifices and sacred foods in the scope of this mitzvah. as [Exodus 29:33] states: "And they shall eat [the sacrifices] with which atonement was made for them."