Leviticus 16:11; Leviticus 16:14

11 "Then Aaron shall offer the bull of the sin offering which is for himself and make atonement for himself and for his household, and he shall slaughter the bull of the sin offering which is for himself.

14 "Moreover, he shall take some of the blood of the bull and sprinkle it with his finger on the mercy seat on the east side; also in front of the mercy seat he shall sprinkle some of the blood with his finger seven times.