Exodus 29:35-37

Amplified Bible

³⁵ “So you shall do to Aaron and to his sons in accordance with all I have commanded you; during seven days you are to ordain them. ³⁶ You shall offer a bull every day as a sin offering for atonement. You shall cleanse the altar from sin when you make atonement for it, and you shall anoint it to consecrate it [for God’s sacred purpose]. ³⁷ For seven days you shall make atonement for the altar [of burnt offering] and consecrate it; then the altar shall be most holy. Whatever touches the altar must be holy (set apart for God’s service).