Exodus 29:36-38

New Revised Standard Version Catholic Edition

³⁶ Also every day you shall offer a bull as a sin offering for atonement. Also you shall offer a sin offering for the altar, when you make atonement for it, and shall anoint it, to consecrate it. ³⁷ Seven days you shall make atonement for the altar, and consecrate it, and the altar shall be most holy; whatever touches the altar shall become holy.

The Daily Offerings

³⁸ Now this is what you shall offer on the altar: two lambs a year old regularly each day.