Exodus 32:27-29 ▼

27 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.’ ”

28 The Levites did as Moses commanded, and about three thousand men fell dead that day among the people.

29 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.”