Exodus 32:27-35

He told them, “This is what the LORD, the God of Israel, says, ‘Every man fasten his sword to his side; go back and forth through the camp from entrance to entrance, and each of you kill his brother, his friend, and his neighbor.’” The Levites did as Moses commanded, and about three thousand men fell dead that day among the people. Afterward Moses said, “Today you have been dedicated to the LORD, since each man went against his son and his brother. Therefore you have brought a blessing on yourselves today.” The following day Moses said to the people, “You have committed a grave sin. Now I will go up to the LORD; perhaps I will be able to atone for your sin.” So Moses returned to the LORD and said, “Oh, these people have committed a grave sin; they have made a god of gold for themselves. Now if you would only forgive their sin. But if not, please erase me from the book you have written.” The LORD replied to Moses, “Whoever has sinned against me I will erase from my book. Now go, lead the people to the place I told you about; see, my angel will go before you. But on the day I settle accounts, I will hold them accountable for their sin.” And the LORD inflicted a plague on the people for what they did with the calf Aaron had made.