Charles Ellicott Commentary Ezekiel 43:22

"And on the second day thou shalt offer a he-goat without blemish for a sin-offering; and they shall cleanse the altar, as they did cleanse it with the bullock." — Ezekiel 43:22 (ASV)

A kid of the goats. More exactly, a buck of the goats. This was the sin offering prescribed for a ruler (Leviticus 4:22–23). The expression “as they did with the bullock,” implies that the ritual was the same, and the flesh burned in the same way. At the consecration of the altar in Exodus 29:36, a bullock was required for the sin offering on each of the seven days for the consecration of both the altar and the priests.