Numbers 1:16-20

¹⁶These are those who were called of the congregation, the princes of the tribes of their fathers; they were the heads of the thousands of Israel.

¹⁷Moses and Aaron took these men who are mentioned by name.

¹⁸They assembled all the congregation together on the first day of the second month; and they declared their ancestry by their families, by their fathers’ houses, according to the number of the names, from twenty years old and upward, one by one.

¹⁹As Yahweh commanded Moses, so he counted them in the wilderness of Sinai.

²⁰The children of Reuben, Israel’s firstborn, their generations, by their families, by their fathers’ houses, according to the number of the names, one by one, every male from twenty years old and upward, all who were able to go out to war: