Ezekiel 45:18-20

“‘This is the Message from GOD, the Master: On the first day of the first month, take an unblemished bull calf and purify the Sanctuary. The priest is to take blood from the sin offerings and rub it on the doorposts of the Temple, on the four corners of the ledge of the altar, and on the gate entrance to the inside courtyard. Repeat this ritual on the seventh day of the month for anyone who sins without knowing it. In this way you make atonement for the Temple.