20 Thus shall he do with the bull; as he did with the bull of the sin offering, so shall he do with this; and the priest shall make atonement for them, and they shall be forgiven.
*Minor differences ignored. Grouped by changes, with first version listed as example.
"And let the priest make an atonement for them, that it may be forgiven them," or, "so will they be forgiven." This formula recurs with all the sin-offerings (with the exception of the one for the high priest), viz., Leviticus 4:26, Leviticus 4:31, Leviticus 4:35, Leviticus 5:10, Leviticus 5:13; Numbers 15:25-26, Numbers 15:28; also with the trespass-offerings, Leviticus 5:16, Leviticus 5:18; Leviticus 19:22, - the only difference being, that in the sin-offerings presented for defilements cleansing is mentioned, instead of forgiveness, as the effect of the atoning sacrifice (Leviticus 12:7-8; Leviticus 13:20, Leviticus 13:53; Numbers 8:21).
For a sin - offering - That is, for the priest's sin - offering, called the first bullock, Leviticus 4:21.
*More commentary available at chapter level.