Numbers 4:2-4

Wycliffe Bible

² Take thou the sum, or the number, of the sons of Kohath, from the midst of (the) Levites, by their houses and families,

³ from the thirtieth year and above unto the fiftieth year, of all that enter, that they stand and minister in the tabernacle of the bond of peace. (from thirty years of age up to fifty years old, of all who enter to serve in the Tabernacle of the Covenant.)

⁴ This is the religion of the sons of Kohath; Aaron and his sons shall enter into the tabernacle of the bond of peace, and into the holy of holy things, (This is the service of the sons of Kohath; Aaron and his sons shall enter into the Tabernacle of the Covenant, and into the Most Holy Place, or the Holy of Holies,)