Êxodo 29:36

36 Sacrifice a bull each day as a sin offering to make atonement. Purify the altar by making atonement for it, and anoint it to consecrate it.

36 Every day an ox is to be offered as a sin-offering, to take away sins: and by this offering on it, you will make the altar clean from sin; and you are to put oil on it and make it holy.