Num Numbers, chapter Book of Numbers, chapter 1

And Moshe [He Who Draws Out Of The Waters] and Aharon [Bright, Very High] took these men which are expressed by [their] names:

And they assembled all the congregation together 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.