Exodus 29:27-31

You shall consecrate the breast of the wave offering and the thigh of the contribution which was waved and which was offered from the ram of ordination, from the one which was for Aaron and from the one which was for his sons.

It shall be for Aaron and his sons as their portion forever from the sons of Israel, for it is a contribution; and it shall be a contribution from the sons of Israel from the sacrifices of their peace offerings, their contribution to the Lord.

“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.