Numbers 1:16-20

¹⁶These were the men appointed from the people. They led their ancestors' tribes. They were the leaders of the clans in Israel.

¹⁷Moses and Aaron took these men, who were recorded by name,

¹⁸and along with these men they assembled all the men of Israel on the first day of the second month. Then each man twenty years old and older identified his ancestry. He had to name the clans and families descended from his ancestors.

¹⁹Then Moses recorded their numbers in the wilderness of Sinai, as Yahweh had commanded him to do.

²⁰From the descendants of Reuben, Israel's firstborn, were counted all the names of each and every man twenty years old or older able to go to war, from the records of their ancestor's clans and families.