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Numbers 8:11
Aaron is to present the Levites before the LORD as a wave offering from the sons of Israel, so that they may perform the service of the LORD.

Numbers 3:23-37
The Gershonite clans were to camp on the west, behind the tabernacle, . . .

Numbers 4:3-32
men from thirty to fifty years old--everyone who is qualified to serve in the work at the Tent of Meeting. . . .

1 Chronicles 23:1
When David was old and full of years, he installed his son Solomon as king over Israel.

1 Chronicles 25:1
Additionally, David and the commanders of the army set apart some of the sons of Asaph, Heman, and Jeduthun to prophesy with the accompaniment of lyres, harps, and cymbals. The following is the list of the men who performed this service:

1 Chronicles 26:1
These were the divisions of the gatekeepers: From the Korahites: Meshelemiah son of Kore, one of the sons of Asaph.

and offer

Numbers 8:11, 13
Aaron is to present the Levites before the LORD as a wave offering from the sons of Israel, so that they may perform the service of the LORD. . . .

Numbers 3:12
"Behold, I have taken the Levites from among the children of Israel in place of every firstborn Israelite from the womb. The Levites belong to Me,