Leviticus 1:5

Then he shall kill the bull before the Lord , and Aaron’s sons the priests shall bring the blood and throw the blood against the sides of the altar that is at the entrance of the tent of meeting .

You are to slaughter the young bull before the Lord, and then Aaron`s sons the priests shall bring the blood and splash it against the sides of the altar at the entrance to the tent of meeting.

And he shall kill the bullock before the Lord : and the priests, Aaron's sons, shall bring the blood, and sprinkle the blood round about upon the altar that is by the door of the tabernacle of the congregation.