Exodus 29:10-12

New Revised Standard Version, Anglicised Catholic Edition

¹⁰ You shall bring the bull in front of the tent of meeting. Aaron and his sons shall lay their hands on the head of the bull, ¹¹ and you shall slaughter the bull before the Lord, at the entrance of the tent of meeting, ¹² and shall take some of the blood of the bull and put it on the horns of the altar with your finger, and all the rest of the blood you shall pour out at the base of the altar.