Numbers 1

1:1 And the LORD spake unto Moses in the wilderness of Sinai, in the tabernacle of the congregation, on the first [day] of the second month, in the second year after they were come out of the land of Egypt, saying,

1:2 Take ye the sum of all the congregation of the children of Israel, after their families, by the house of their fathers, with the number of [their] names, every male by their polls;

1:3 From twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies.