Ezekiel 43:27 WBT

²⁵  Seven days shalt thou prepare every day a goat [for] a sin-offering: they shall also prepare a young bullock, and a ram out of the flock, without blemish.

²⁶  Seven days shall they purge the altar and purify it; and they shall consecrate themselves.

²⁷  And when these days have expired, it shall be, [that] upon the eighth day, and [so] forward, the priests shall make your burnt-offerings upon the altar, and your peace-offerings: and I will accept you, saith the Lord GOD.