Exodus 32:27-29

Leeser(i) 27 And he said unto them, Thus hath said the Eternal, the God of Israel, Put ye every man his sword by his side, and go ye hither and thither, from gate to gate in the camp, and slay ye every man his brother, and every man his companion, and every man his relative. 28 And the children of Levi did according to the word of Moses: and there fell of the people on that day about three thousand men. 29 And Moses said, Consecrate yourselves today to the Lord, yea even every man on his son, and on his brother; and to bestow upon you this day a blessing.