Exodus 29:29-33

“The holy garments of Aaron shall be for his sons after him, so that they may be anointed and ordained in them.

For seven days the one of his sons who is priest in his place shall put them on when he enters the tent of meeting to minister in the Holy Place. Food of the Priests

“Now you shall take the ram of ordination and boil its flesh in a holy place.

Then Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket, at the doorway of the tent of meeting.

So they shall eat those things by which atonement was made at their ordination and consecration; but a layman shall not eat them, because they are holy.