Numbers 8:14 in the King James Version
Thus shalt thou separate the Levites from among the children of Israel: and the Levites shall be mine.
Context
13 You shall set the Levites before Aaron and before his sons, and offer them as a wave offering to the LORD.
14 Thus you shall separate the Levites from among the children of Israel, and the Levites shall be mine.
15 “After that, the Levites shall go in to do the service of the Tent of Meeting. You shall cleanse them, and offer them as a wave offering.