Exodus 32:27-28

VIN(i) 27 He said to them, "This is what the LORD, the God of Israel, says, 'Every man put his sword on his thigh, and go back and forth from gate to gate in the camp, and each of you kill his brother and friend and neighbor.'" 28 The Levites did just as Moses told them, and about 3,000 people died that day.