Exodus 29:29-33

29The holy garments that belong to Aaron will belong to his sons after him, so they can be anointed and ordained in them. 30The son who succeeds him as priest and enters the Tent of Meeting to minister in the Holy Place must wear them for seven days.

31You are to take the ram of ordination and boil its flesh in a holy place. 32At the entrance to the Tent of Meeting, Aaron and his sons are to eat the meat of the ram and the bread that is in the basket. 33They must eat those things by which atonement was made for their ordination and consecration. But no outsider may eat them, because these things are sacred.