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 29:12

29:12 and take some of the blood of the bull and put it on the horns of the altar with your finger; all the rest of the blood you are to pour out at the base of the altar.

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.