Exodus 29:11

"And he slew it; and Moses took the blood, and put it upon the horns of the altar round about with his finger, and purified the altar, and poured the blood at the bottom of the altar, and sanctified it, to make reconciliation upon it."

"Aaron therefore went unto the altar, and slew the calf of the sin offering, which was for himself."

"And Aaron and his sons thou shalt bring unto the door of the tabernacle of the congregation, and shalt wash them with water."

"And he slew the burnt offering; and Aaron's sons presented unto him the blood, which he sprinkled round about upon the altar."