Exodus 32:28

The Levites did as Moses commanded, and that day about three thousand of the people died.

(New International Version)

So the sons of Levi did as Moses instructed, and about three thousand men of the people fell that day.

(New American Standard Bible)

And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.

(King James Version)