C. F. Keil and Franz Delitzsch on Leviticus 4:20-21

Lev 4:20-21

“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., Lev 4:26, Lev 4:31, Lev 4:35, Lev 5:10, Lev 5:13; Num 15:25-26, Num 15:28; also with the trespass-offerings, Lev 5:16, Lev 5:18; Lev 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 (Lev 12:7-8; Lev 13:20, Lev 13:53; Num 8:21).

The sin of a ruler. - Lev 4:22. אשׁר: ὅτε, when. נשׂיא is the head of a tribe, or of a division of a tribe (Num 3:24, Num 3:30, Num 3:35).