Numbers 4:21-23 Evangelical Heritage Version (EHV)
The Duties of the Gershonites
21 The Lord also told Moses 22 to take a census of the descendants of Gershon, according to their fathers’ houses, by their clans, 23 and to register those from thirty years old to fifty years old, everyone eligible for the service of doing the work at the Tent of Meeting.
Numbers 4:21-23 New International Version (NIV)
21 The Lord said to Moses, 22 “Take a census also of the Gershonites by their families and clans. 23 Count all the men from thirty to fifty years of age who come to serve in the work at the tent of meeting.