Numbers 1:17-19 ▼

17 So Moses and Aaron took these men who had been designated by name,

18 and they assembled all the congregation together on the first of the second month. Then they registered by genealogy in their families, by their fathers’ households, according to the number of names, from twenty years old and upward, head by head,

19 just as Yahweh had commanded Moses. So he numbered them in the wilderness of Sinai.