Numbers 1:18–20

18 and they summoned the entire community on the first day of the second month. And they registered themselves among their clans according to their families,j according to the number of names from those twenty years oldk and above individually, 19 just as Yahweh commanded Moses. And he counted them in the desert of Sinai.

20 The descendants of Reuben, the firstborn of Israel, their genealogies according to their clans, according to their families,l according to the number of names, every male individually from twenty years oldm and above, everyone who is able to go to war:

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