Ezekiel 45:18-20

‘Thus says the Lord GOD: “In the first month, on the first day of the month, you shall take a young bull without blemish and cleanse the sanctuary. The priest shall take some of the blood of the sin offering and put it on the doorposts of the temple, on the four corners of the ledge of the altar, and on the gateposts of the gate of the inner court. And so you shall do on the seventh day of the month for everyone who has sinned unintentionally or in ignorance. Thus you shall make atonement for the temple.