The approbation of this deed, in the house of Levi, Moses records in the close of his life. Deuteronomy 33:9.
Related Commentaries of Exodus 32:28
Exodus 32:28-29
28 And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.
29 For Mosesb had said, Consecrate yourselves to day to the LORD, even every man upon his son, and upon his brother; that he may bestow upon you a blessing this day.