Numbers 4:30

Take the number of them from five and twenty years old and upwards until fifty years old, every one that goes in to perform the services of the tabernacle of witness.

From thirty years old and upward even unto fifty years old shalt thou number them, every one that entereth into the service, to do the work of the tabernacle of the congregation.

you shall count them from thirty years old and upward even to fifty years old—everyone who enters on the service, to do the work of the Tent of Meeting.