Observe here, 1. That God takes notice of and is displeased with the sins of rulers. Those who have power to call others to account are themselves accountable to the ruler of rulers; for, as high as they are, there is a higher than they. This is intimated in that the commandment transgressed is here said to be the commandment of the Lord his God, Lev 4:22. He is a prince to others, but let him know the Lord is a God to him. 2. The sin of the ruler which he committed through ignorance is supposed afterwards to come to his knowledge (Lev 4:23), which must be either by the check of his own conscience or by the reproof of his friends, both which we should all, even the best and greatest, not only submit to, but be thankful for. What we have done amiss we should be very desirous to come to the knowledge of. That which I see not, teach thou me, and show me wherein I have erred, are prayers we should put up to God every day, that though through ignorance we fall into sin we may not through ignorance lie still in it. 3. The sin-offering for a ruler was to be a kid of the goats, not a bullock, as for the priest and the whole congregation; nor was the blood of his sin-offering to be brought into the tabernacle, as of the other two, but it was all bestowed upon the brazen altar (Lev 4:25); nor was the flesh of it to be burnt, as that of the other two, without the camp, which intimated that the sin of a ruler, though worse than that of a common person, yet was not so heinous, nor of such pernicious consequence, as the sin of the high priest, or of the whole congregation. A kid of the goats was sufficient to be offered for a ruler, but a bullock for a tribe, to intimate that the ruler, though major singulis - greater than each, was minor universis - less than the whole. It is bad when great men give bad examples, but worse when all men follow them. 4. It is promised that the atonement shall be accepted and the sin forgiven (Lev 4:26), that is, if he repent and reform; for otherwise God swore concerning Eli, a judge in Israel, that the iniquity of his house should not be purged with sacrifice nor offering for ever, Sa1 3:14.

When a ruler hath sinned - Under the term נשיא nasi, it is probable that any person is meant who held any kind of political dignity among the people, though the rabbins generally understand it of the king.
A kid of the goats was the sacrifice in this case, the rites nearly the same as in the preceding cases, only the fat was burnt as that of the peace-offering. See Lev 4:26 and Lev 3:5.

And he shall burn all his fat upon the altar, Of burnt offering, that is, the priest shall do it:

as the fat of the sacrifice of peace offerings; see Lev 3:3.

and the priest shall make an atonement for him as concerning his sin; in a typical way, directing to the great sacrifice of Christ, which is the only real atonement and propitiation for sin: the Vulgate Latin, Syriac, and Arabic versions, render, "the priest shall pray for him": for the pardon of his sin:

and it shall be forgiven him; not for the prayers of the priest, nor for the sacrifice offered up, but for the sake of Christ, the antitype of such sacrifices, and when faith was exercised on him; or the meaning is, he shall not be punished for it.

When a ruler hath sinned, and done somewhat through ignorance against any of the commandments--Whatever was the form of government, the king, judge, or subordinate, was the party concerned in this law. The trespass of such a civil functionary being less serious in its character and consequences than that either of the high priest or the congregation, a sin offering of inferior value was required--"a kid of the goats"; and neither was the blood carried into the sanctuary, but applied only to the altar of burnt offering; nor was the carcass taken without the camp; it was eaten by the priests-in-waiting.