Leviticus 4:7
7 And the priest ashall put some of the blood on the horns of the altar of fragrant incense before the Lord that is in the tent of meeting, and ball the rest of the blood of the bull he shall pour out at the base of the altar of burnt offering that is at the entrance of the tent of meeting.
Ezekiel 43:20
20 And myou shall take some of its blood and put it on ethe four horns of the altar and on the four corners of the ledge and upon nthe rim all around. oThus you shall purify the altar and make atonement for it.
Ezekiel 43:26
26 Seven days shall they make atonement for the altar and cleanse it, and so consecrate it.1
Hebrews 9:22
22 Indeed, under the law almost everything is purified with blood, and fwithout the shedding of blood there is no forgiveness of sins.