Ezekiel 45:18-20

Thus saith the Lord Jehovah: In the first month, in the first day of the month, thou shalt take a young bullock without blemish; and thou shalt cleanse the sanctuary. And the priest shall take of the blood of the sin-offering, and put it upon the door-posts of the house, and upon the four corners of the ledge of the altar, and upon the posts of the gate of the inner court. And so thou shalt do on the seventh day of the month for every one that erreth, and for him that is simple: so shall ye make atonement for the house.