Exodus 32:27

27 And he said to them, "Thus says the LORD God of Israel, 'Put every man his sword on his side, and go to and fro from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbor.'"

Exodus 32:27 In-Context

25 And when Moses saw that the people had broken loose (for Aaron had let them break loose, to their shame among their enemies),
26 then Moses stood in the gate of the camp, and said, "Who is on the LORD's side? Come to me." And all the sons of Levi gathered themselves together to him.
27 And he said to them, "Thus says the LORD God of Israel, 'Put every man his sword on his side, and go to and fro from gate to gate throughout the camp, and slay 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, "Today you have ordained yourselves for the service of the LORD, each one at the cost of his son and of his brother, that he may bestow a blessing upon you this day."
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.