Leviticus 6:20-23

6:20 “This is the offering of Aaron and his sons which they must present to the Lord on the day when he is anointed: a tenth of an ephah of choice wheat flour as a continual grain offering, half of it in the morning and half of it in the evening. 6:21 It must be made with olive oil on a griddle and you must bring it well soaked, so you must present a grain offering of broken pieces as a soothing aroma to the Lord. 6:22 The high priest who succeeds him from among his sons must do it. It is a perpetual statute; it must be offered up in smoke as a whole offering to the Lord. 6:23 Every grain offering of a priest must be a whole offering; it must not be eaten.”

Exodus 29:1

The Consecration of Aaron and His Sons

29:1 “Now this is what you are to do for them to consecrate them so that they may minister as my priests. Take a young bull and two rams without blemish;