Numbers 1:47-54
But the Levites after the tribe of their fathers were not numbered among them.
Nave's Topical Index—AKJV

Numbers 3:6-16
Bring the tribe of Levi near, and present them before Aaron the priest, that they may minister to him.
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Numbers 16:9
Seems it but a small thing to you, that the God of Israel has separated you from the congregation of Israel, to bring you near to himself to do the service of the tabernacle of the LORD, and to stand before the congregation to minister to them?
Nave's Topical Index—AKJV

Numbers 26:57-62
And these are they that were numbered of the Levites after their families: of Gershon, the family of the Gershonites: of Kohath, the family of the Kohathites: of Merari, the family of the Merarites.
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Deuteronomy 10:8
At that time the LORD separated the tribe of Levi, to bear the ark of the covenant of the LORD, to stand before the LORD to minister to him, and to bless in his name, to this day.
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1 Chronicles 15:2
Then David said, None ought to carry the ark of God but the Levites: for them has the LORD chosen to carry the ark of God, and to minister to him for ever.
Nave's Topical Index—AKJV