Exodus 32:26-29

MLV(i) 26 then Moses stood in the gate of the camp and said, Whoever is on Jehovah's side, come to me. And all the sons of Levi gathered themselves together to him. 27 And he said to them, Jehovah says thus, the God of Israel, Put every man his sword upon his thigh and go to and fro from gate to gate throughout the camp and kill* every man his brother and every man his companion and every man his neighbor.
28 And the sons of Levi did according to the word of Moses. And there fell of the people that day about three thousand men. 29 And Moses said, Consecrate yourselves today to Jehovah, yes, every man against his son and against his brother, that he may bestow upon you* a blessing this day.