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;

Exodus 29:36

29:36 Every day you are to prepare a bull for a purification offering for atonement. You are to purge the altar by making atonement for it, and you are to anoint it to set it apart as holy.