Exodus 29:37 in the King James Version
Seven days thou shalt make an atonement for the altar, and sanctify it; and it shall be an altar most holy: whatsoever toucheth the altar shall be holy.
Context
36 Every day you shall offer the bull of sin offering for atonement. You shall cleanse the altar when you make atonement for it. You shall anoint it, to sanctify it.
37 Seven days you shall make atonement for the altar, and sanctify it; and the altar shall be most holy. Whatever touches the altar shall be holy.
38 “Now this is that which you shall offer on the altar: two lambs a year old day by day continually.