Exodus 32:27-28

Exodus 32:27-28 CSB

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.
CSB: Christian Standard Bible