Numbers 1:17

14 Of Gad; Eliasaph the son of Deuel.

15 Of Naphtali; Ahira the son of Enan.

16 These [were] the renowned of the congregation, princes of the tribes of their fathers, heads of thousands in Israel.

17 And Moses and Aaron took these men who are expressed by [their] names:

18 And they assembled all the congregation on the first [day] of the second month, and they declared their pedigrees after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, by their polls.

19 As the LORD commanded Moses, so he numbered them in the wilderness of Sinai.

20 And the children of Reuben, Israel's eldest son, by their generations, after their families, by the house of their fathers, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;