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.

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.