Ezekiel 43:26-27

Young's Literal Translation

²⁶ Seven days they purify the altar, and have cleansed it, and filled their hand.

²⁷ And the days are completed, and it hath come to pass on the eighth day, and henceforth, the priests prepare on the altar your burnt-offerings and your peace-offerings, and I have accepted you -- an affirmation of the Lord Jehovah.'