TSK · Numbers 3:9

For they are entirely given to me from among the Israelites. I have taken them for myself instead of all who open the womb, the firstborn sons of all the Israelites.

I have given the Levites as a gift to Aaron and his sons from among the Israelites, to do the work for the Israelites in the tent of meeting, and to make atonement for the Israelites, so there will be no plague among the Israelites when the Israelites come near the sanctuary.”

I myself have chosen your brothers the Levites from among the Israelites. They are given to you as a gift from the LORD, to perform the duties of the tent of meeting.

Then David said,“Only the Levites may carry the ark of God, for the LORD chose them to carry the ark of the LORD and to serve before him perpetually.”

They appointed the priests by their divisions and the Levites by their divisions over the worship of God at Jerusalem, in accord with the book of Moses.

Therefore it says,“When he ascended on high he captured captives; he gave gifts to men.”