Exodus 32:25-29

Moses saw that the people were simply running wild—Aaron had let them run wild, disgracing themselves before their enemies. He took up a position at the entrance to the camp and said, “Whoever is on GOD’s side, join me!” All the Levites stepped up. He then told them, “GOD’s orders, the God of Israel: ‘Strap on your swords and go to work. Crisscross the camp from one end to the other: Kill brother, friend, neighbor.’” The Levites carried out Moses’ orders. Three thousand of the people were killed that day. Moses said, “You confirmed your ordination today—and at great cost, even killing your sons and brothers! And God has blessed you.”