Exodus 32:25-27

Amplified Bible

²⁵ Now when Moses saw that the people were out of control—for Aaron had let them get out of control to the point of being an object of mockery among their enemies— ²⁶ then Moses stood in the gate of the camp, and said, “Whoever is on the Lord’s side, come to me!” And all the sons of Levi [the priestly tribe] gathered together to him. ²⁷ He said to them, “Thus says the Lord God of Israel, ‘Every man strap his sword on his thigh and go back and forth from gate to gate throughout the camp, and every man kill his brother, and every man his friend, and every man his neighbor [all who continue pagan worship].’”