Exodus 32:25

23For they said to me, ‘Make us gods, which shall go before us. As for this Moses, the man who brought us up out of the land of Egypt, we don’t know what has become of him.’

24I said to them, ‘Whoever has any gold, let them take it off.’ So they gave it to me; and I threw it into the fire, and out came this calf.”

25When Moses saw that the people were out of control, (for Aaron had let them lose control, causing derision among their enemies),

26then Moses stood in the gate of the camp, and said, “Whoever is on the LORD’s side, come to me!” All the sons of Levi gathered themselves together to him.

27He said to them, “The LORD, the God of Israel, says, ‘Every man put his sword on his thigh, and go back and forth from gate to gate throughout the camp, and every man kill his brother, and every man his companion, and every man his neighbor.’”