Exodus 29:35-37 NIV

35 "Do for Aaron and his sons everything I have commanded you, taking seven days to ordain them.
36 Sacrifice a bull each day1 as a sin offering to make atonement2. Purify the altar by making atonement for it, and anoint it to consecrate3 it.

References for Exodus 29:36

37 For seven days make atonement for the altar and consecrate it. Then the altar will be most holy, and whatever touches it will be holy.4

References for Exodus 29:37