Exodus 32:28 in the King James Version
And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.
Context
27 He said to them, “The LORD, the God of Israel, says, ‘Every man put 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 companion, and every man his neighbor.’”
28 The sons of Levi did according to the word of Moses. About three thousand men fell of the people that day.
29 Moses said, “Consecrate yourselves today to the LORD, for every man was against his son and against his brother, that he may give you a blessing today.”