Exod.30:  Aaron shall make atonement upon its horns once a year; with the blood of the sin offering of atonement he shall make atonement for it once in the year throughout your generations; it is most holy to the LORD.”
Lev.5:  and he shall bring his guilt offering to the LORD for the sin which he has committed, a female from the flock, a lamb or a goat, for a sin offering; and the priest shall make atonement for him for his sin
Lev. 5:  Then he shall offer the second for a burnt offering according to the ordinance; and the priest shall make atonement for him for the sin which he has committed, and he shall be forgiven.  Thus the priest shall make atonement for him for the sin which he has committed in any one of these things, and he shall be forgiven. And the remainder shall be for the priest, as in the cereal offering.”
Lev. 10:  “Why have you not eaten the sin offering in the place of the sanctuary, since it is a thing most holy and has been given to you that you may bear the iniquity of the congregation, to make atonement for them before the LORD?
[Lev. 14: 19] The priest shall offer the sin offering, to make atonement for him who is to be cleansed from his uncleanness. And afterward he shall kill the burnt offering;
Lev.19:  And the priest shall make atonement for him with the ram of the guilt offering before the LORD for his sin which he has committed; and the sin which he has committed shall be forgiven him.
AND THIS ONE I LOVE FOR IT’S CLEAR SYMBOLISM!~
Lev. 16: 5 And he shall take from the congregation of the people of Israel two male goats for a sin offering, and one ram for a burnt offering.  And Aaron shall present the goat on which the lot fell for the LORD, and offer it as a sin offering;  “Then he shall kill the goat of the sin offering which is for the people, and bring its blood within the veil, and do with its blood as he did with the blood of the bull, sprinkling it upon the mercy seat and before the mercy seat;  and Aaron shall lay both his hands upon the head of the live goat, and confess over him all the iniquities of the people of Israel, and all their transgressions, all their sins; and he shall put them upon the head of the goat, and send him away into the wilderness by the hand of a man who is in readiness.