Exodus 29:14-16

New Revised Standard Version Catholic Edition

¹⁴ But the flesh of the bull, and its skin, and its dung, you shall burn with fire outside the camp; it is a sin offering.

¹⁵ Then you shall take one of the rams, and Aaron and his sons shall lay their hands on the head of the ram, ¹⁶ and you shall slaughter the ram, and shall take its blood and dash it against all sides of the altar.