Exodus 29:33-37

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.

29:35 “Thus you are to do for Aaron and for his sons, according to all that I have commanded you; you are to consecrate them for seven days. 29:36 Every day you are to prepare a bull for a purification offering for atonement. You are to purge the altar by making atonement for it, and you are to anoint it to set it apart as holy. 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.

Exodus 29:44

29:44 “So I will set apart as holy the tent of meeting and the altar, and I will set apart as holy Aaron and his sons, that they may minister as priests to me.