The tribe of Levi, Moses' own tribe, now distinguished itself by immediately returning to its allegiance and obeying the call to fight on the side of Yahweh. We need not doubt that the 3,000 who were slain were those who persisted in resisting Moses. The spirit of the narrative forbids us to conceive that the act of the Levites was anything like an indiscriminate massacre. An amnesty had first been offered to all by the words: "Who is on the Lord's side?" Those who were forward to draw the sword were directed not to spare their closest relations or friends; but this must plainly have been with an understood qualification as regards the conduct of those who were to be slain. Had it not been so, they who were on the Lord's side would have had to destroy each other. We need not stumble at the bold, simple way in which the statement is made.

Who is on the Lord's side? - That is, Who among you is free from this transgression? And all the sons of Levi, etc. - It seems they had no part in this idolatrous business.

Then Moses stood in the gate of the camp,.... In one of the gates of it; for it doubtless had more than one to go in and out of, as is clear from Exodus 32:27 it being probably entrenched all around; here Moses set himself, it being the usual place, as in cities, where the people were summoned together on important occasions, and justice and judgment were administered:

and said, who is on the Lord's side? let him come unto me; who is for the worship of the true God, and him only, and against the worship of a gold calf, or any other idol, and is zealous for the glory of God, and the honour of his name:

and all the sons of Levi gathered themselves together unto him; that is, all those that had not given in to the idolatry of the calf; all is put for many. Jarchi infers from hence, that this tribe was wholly free from that sin; but the contrary is most evident, for it appears from the context that many of them were slain for it; yea, as, on the one hand, they were only of the tribe of Levi, who joined themselves to Moses, though there was no doubt many in all the tribes that were not in the idolatry; so, on the other hand, there were none slain, or very few, but of the tribe of Levi, as will appear in the exposition of the following verses, the being principally concerned with Aaron in making the calf; and therefore those of the same tribe that joined them not were the more zealous and studious to purge themselves from the imputation of the crime, by going over to Moses at once, and showing themselves to be on the Lord's side.

Then Moses stood in the gate of the camp, and said, Who is on the LORD's side? let him come unto me. And all the sons of Levi gathered themselves together unto him.

32:26 Then Moses stood in the gate of the camp, the place of judgment; and said, Who is on the Lord's side? - The idolaters had set up the golden calf for their standard, and now Moses sets up his in opposition to them.

26-28. Moses stood in the gate of the camp, and said-The camp is supposed to have been protected by a rampart after the attack of the Amalekites.

Who is on the Lord's side? let him come unto me-The zeal and courage of Moses was astonishing, considering he opposed an intoxicated mob. The people were separated into two divisions, and those who were the boldest and most obstinate in vindicating their idolatry were put to death, while the rest, who withdrew in shame or sorrow, were spared.

32:21-29 Never did any wise man make a more frivolous and foolish excuse than that of Aaron. We must never be drawn into sin by any thing man can say or do to us; for men can but tempt us to sin, they cannot force us. The approach of Moses turned the dancing into trembling. They were exposed to shame by their sin. The course Moses took to roll away this reproach, was, not by concealing the sin, or putting any false colour upon it, but by punishing it. The Levites were to slay the ringleaders in this wickedness; yet none were executed but those who openly stood forth. Those are marked for ruin who persist in sin: those who in the morning were shouting and dancing, before night were dying. Such sudden changes do the judgments of the Lord sometimes make with sinners that are secure and jovial in their sin.