The Levites did as Moses commanded, and that day about three thousand of the people fell dead.
Moses, having shown his just indignation against the sin of Israel by breaking the tables and burning the calf, now proceeds to reckon with the sinners and to call them to an account, herein acting as the representative of God, who is not only a holy God, and hates sin, but a just God, and is engaged in honour to punish it, Isa 59:18. Now, I.
Commenting on Exodus 32:21-29
For Moses had said,.... To the Levites, when he first gave them their orders: consecrate yourselves today to the Lord; devote yourselves to his service, by obeying his orders, slaying those, or the heads of them, who have cast so much contempt upon him as to worship the golden calf in his room; and which would be as acceptable to him as the offerings were...
There fell about three thousand men - These were no doubt the chief transgressors; having broken the covenant by having other gods besides Jehovah, they lost the Divine protection, and then the justice of God laid hold on and slew them.