Leviticus 1:5
And the ox is to be put to death before the Lord: then Aaron's sons, the priests, are to take the blood and put some of it on and round the altar which is at the door of the Tent of meeting.And the ox is to be put to death before the Lord: then Aaron's sons, the priests, are to take the blood and put some of it on and round the altar which is at the door of the Tent of meeting.