Exodus 29:36
And you shall offer every day a bullock a sin offering for atonement: and you shall cleanse the altar, when you hast made an atonement for it, and you shall anoint it, to sanctify it.
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Context
34 And if ought of the flesh of the consecrations, or of the bread, remain unto the morning, then you shall burn the remainder with fire: it shall not be eaten, because it holy.
35 And thus shall you do unto Aaron, and to his sons, according to all which I have commanded you: seven days shall you consecrate them.
36 And you shall offer every day a bullock a sin offering for atonement: and you shall cleanse the altar, when you hast made an atonement for it, and you shall anoint it, to sanctify it.
37 Seven days you shall make an atonement for the altar, and sanctify it; and it shall be an altar most holy: whatsoever toucheth the altar shall be holy.
38 Now this which you shall offer upon the altar; two lambs of the first year day by day continually.