Exodus 32:28 DBY

²⁶  And Moses stood in the gate of the camp, and said, He that is for Jehovah, [let him come] to me. And all the sons of Levi gathered to him.

²⁷  And he said to them, Thus saith Jehovah, the God of Israel: Put every man his sword upon his hip; go and return from gate to gate through the camp, and slay every man his brother, and every man his friend, and every man his neighbour.

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 to-day to Jehovah, yea, every man with his son, and with his brother, and bring on yourselves a blessing to-day.

³⁰  And it came to pass the next day, that Moses said to the people, Ye have sinned a great sin. And now I will go up to Jehovah: perhaps I shall make atonement for your sin.