As the sin offering is, so is the trespass offering: there is one law for them: the priest that maketh atonement therewith shall have it.
Leviticus 14:11
And the priest that maketh him clean shall present the man that is to be made clean, and those things, before the LORD, at the door of the tabernacle of the congregation:
Leviticus 17:11
For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.