“You shall take of the blood of the bull, and put it on the horns of the altar with your finger; and you shall pour out all the blood at the base of the altar.”
Exodus 29:12 (WEB)
Context Reading
10“You shall bring the bull before the Tent of Meeting; and Aaron and his sons shall lay their hands on the head of the bull. 11You shall kill the bull before Yahweh at the door of the Tent of Meeting. 12You shall take of the blood of the bull, and put it on the horns of the altar with your finger; and you shall pour out all the blood at the base of the altar. 13You shall take all the fat that covers the innards, the cover of the liver, the two kidneys, and the fat that is on them, and burn them on the altar. 14But the meat of the bull, and its skin, and its dung, you shall burn with fire outside of the camp. It is a sin offering.