Exodus 32:19-28

And as soon as he approached the camp and he saw the calf and the dancing, Moses’ anger burned; and he threw the tablets from his hands and smashed them at the foot of the mountain. Then Moses took the calf they had made and burned it in the fire, and ground it to powder, and scattered it on the surface of the water and made the Israelites drink it. Then Moses said to Aaron, “What did this people do to you, that you have brought so great a sin on them?” Aaron said, “Do not let the anger of my lord burn; you know the people yourself, that they are prone to evil. For they said to me, ‘Make us a god who will go before us; as for this Moses, the man who brought us out of the land of Egypt, we do not know what has become of him.’ I said to them, ‘Let whoever has gold [jewelry], take it off.’ So they gave it to me; then I threw it into the fire, and out came this calf.” 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— 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. 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].’ ” So the sons of Levi did as Moses instructed, and about three thousand men of the people [of Israel] were killed that day.