Exodus 32:23-28

For they said to me, ‘Make us gods who shall go before us. As for this Moses, the man who brought us up out of the land of Egypt, we do not know what has become of him.’ So I said to them, ‘Let any who have gold take it off.’ So they gave it to me, and I threw it into the fire, and out came this calf.” And when Moses saw that the people had broken loose (for Aaron had let them break loose, to the derision of their enemies), then Moses stood in the gate of the camp and said, “Who is on the LORD’s side? Come to me.” And all the sons of Levi gathered around him. And he said to them, “Thus says the LORD God of Israel, ‘Put your sword on your side each of you, and go to and fro from gate to gate throughout the camp, and each of you kill his brother and his companion and his neighbor.’” And the sons of Levi did according to the word of Moses. And that day about three thousand men of the people fell.