Numbers 4:23
you shall count them from thirty years old and upward until fifty years old: all who enter in to wait on the service, to do the work in the Tent of Meeting.
World English Bible (Public Domain)
In context
Before · Numbers 4:21–22
21The LORD spoke to Moses, saying, 22“Take a census of the sons of Gershon also, by their fathers’ houses, by their families;
23you shall count them from thirty years old and upward until fifty years old: all who enter in to wait on the service, to do the work in the Tent of Meeting.