Numbers 4:39-41

New Revised Standard Version, Anglicised

³⁹ from thirty years old up to fifty years old, everyone who qualified for work relating to the tent of meeting— ⁴⁰ their enrolment by their clans and their ancestral houses was two thousand six hundred and thirty. ⁴¹ This was the enrolment of the clans of the Gershonites, all who served at the tent of meeting, whom Moses and Aaron enrolled according to the commandment of the Lord.