Ezekiel 43:25-27

“For seven days you will prepare every day a goat for a sin offering, they will also prepare a young bullock and a ram out of the flock without blemish. For seven days they will make atonement for the altar and purify it. So will they consecrate it (fill its hands). And when they have accomplished the days it shall be that on the eighth day, and from then on, the priests will make your burnt offerings on the altar and your peace offerings, and I will accept you,” says the Lord Yahweh.'

The process was to go on for seven days, with a sin offering, followed by whole (burnt) offerings, every day. This would thoroughly purify the altar, and consecrate it. From then on it would be clean for the purpose of offering whole offerings and peace offerings to Yahweh. The peace offerings included parts that could be eaten by the priests, and in many cases by the people. This would not have been possible had the altar not been fully clean. This speaks strongly of Old Testament sacrifice.

Note that all the offerings are to be made by the priests. In earlier times the people themselves in many cases participated in the acts of sacrifice, but now it was limited to the priests. ‘And I will accept you.' Once the proper rites had been gone through and the continuing sacrifices offered, the people could be confident of God's acceptance of them through it.