Exodus 29:33

29 The holy garments that belong to Aaron will belong to his sons after him, so they can be anointed and ordained in them.

30 The son who succeeds him as priest and enters the Tent of Meeting to minister in the Holy Place must wear them for seven days.

31 You are to take the ram of ordination and boil its flesh in a holy place.

32 At 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.

33 They 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.

34 And if any of the meat of ordination or any bread is left until the morning, you are to burn up the remainder. It must not be eaten, because it is sacred.

35 This is what you are to do for Aaron and his sons based on all that I have commanded you, taking seven days to ordain them.

36 Sacrifice a bull as a sin offering each day for atonement. Purify the altar by making atonement for it, and anoint it to consecrate it.

37 For seven days you shall make atonement for the altar and consecrate it. Then the altar will become most holy; whatever touches the altar will be holy.

Read all of Exodus 29