Numbers 4:47

from five and twenty years old and upward till fifty years old, every one that goes in to the service of the works, and the [charge of] the things that are carried in the tabernacle of witness.

From thirty years old and upward even unto fifty years old, every one that came to do the service of the ministry, and the service of the burden in the tabernacle of the congregation,

from thirty years old and upward even to fifty years old, everyone who entered in to do the work of service and the work of bearing burdens in the Tent of Meeting,