Exodus 30:10
And Aaron shall make an atonement on the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement on it throughout your generations: it is most holy to the LORD.
Torrey's Topical Textbook—AKJV

Leviticus 16:15,16
Then shall he kill the goat of the sin offering, that is for the people, and bring his blood within the veil, and do with that blood as he did with the blood of the bullock, and sprinkle it on the mercy seat, and before the mercy seat:
Torrey's Topical Textbook—AKJV