Numbers 3:12,41-45
And I, behold, I have taken the Levites from among the children of Israel instead of all the firstborn that opens the matrix among the children of Israel: therefore the Levites shall be mine;
Nave's Topical Index—AKJV

Numbers 8:14,16-18
Thus shall you separate the Levites from among the children of Israel: and the Levites shall be mine.
Nave's Topical Index—AKJV

Numbers 18:6
And I, behold, I have taken your brothers the Levites from among the children of Israel: to you they are given as a gift for the LORD, to do the service of the tabernacle of the congregation.
Nave's Topical Index—AKJV