Numbers 1:32

1:32 From the sons of Joseph:

From the descendants of Ephraim: According to the records of their clans and families, all the males twenty years old or older who could serve in the army were listed by name.

Numbers 4:41

4:41 These were those numbered from the families of the Gershonites, everyone who served in the tent of meeting, whom Moses and Aaron numbered according to the word of the Lord.