Ezekiel 45:18-20

18“‘This is what the sovereign Lord says: In the first month, on the first day of the month, you must take an unblemished young bull and purify the sanctuary.

19The priest will take some of the blood of the sin offering and place it on the doorpost of the temple, on the four corners of the ledge of the altar, and on the doorpost of the gate of the inner court.

20This is what you must do on the seventh day of the month for anyone who sins inadvertently or through ignorance; so you will make atonement for the temple.