Exodus 29:29-31

New Revised Standard Version, Anglicised Catholic Edition

²⁹ The sacred vestments of Aaron shall be passed on to his sons after him; they shall be anointed in them and ordained in them. ³⁰ The son who is priest in his place shall wear them for seven days, when he comes into the tent of meeting to minister in the holy place.

³¹ You shall take the ram of ordination, and boil its flesh in a holy place;