Numbers 4:3 KJV
From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.
Numbers 4:3, King James Version
In context
2 Take the sum of the sons of Kohath from among the sons of Levi, after their families, by the house of their fathers,
3 From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.
4 This shall be the service of the sons of Kohath in the tabernacle of the congregation, about the most holy things: