Exodus 29:33-34

29:33 They are to eat those things by which atonement was made to consecrate and to set them apart, but no one else may eat them, for they are holy. 29:34 If any of the meat from the consecration offerings or any of the bread is left over until morning, then you are to burn up what is left over. It must not be eaten, because it is holy.

Exodus 29:37

29:37 For seven days you are to make atonement for the altar and set it apart as holy. Then the altar will be most holy. Anything that touches the altar will be holy.