TSK · Leviticus 1:11

Then the one presenting the offering must slaughter the bull before the LORD, and the sons of Aaron, the priests, must present the blood and splash the blood against the sides of the altar which is at the entrance of the Meeting Tent.

“Tell Aaron and his sons,‘This is the law of the sin offering. In the place where the burnt offering is slaughtered the sin offering must be slaughtered before the LORD. It is most holy.

The Burnt Offering for the Priests He then slaughtered the burnt offering, and his sons handed the blood to him and he splashed it against the altar’s sides.