Exodus 32:26-33

So he stood at the entrance to the camp and shouted, “All of you who are on the LORD’s side, come here and join me.” And all the Levites gathered around him. Moses told them, “This is what the LORD, the God of Israel, says: Each of you, take your swords and go back and forth from one end of the camp to the other. Kill everyone—even your brothers, friends, and neighbors.” The Levites obeyed Moses’ command, and about 3,000 people died that day. Then Moses told the Levites, “Today you have ordained yourselves for the service of the LORD, for you obeyed him even though it meant killing your own sons and brothers. Today you have earned a blessing.” The next day Moses said to the people, “You have committed a terrible sin, but I will go back up to the LORD on the mountain. Perhaps I will be able to obtain forgiveness for your sin.” So Moses returned to the LORD and said, “Oh, what a terrible sin these people have committed. They have made gods of gold for themselves. But now, if you will only forgive their sin—but if not, erase my name from the record you have written!” But the LORD replied to Moses, “No, I will erase the name of everyone who has sinned against me.