Numbers 1:16-18

¹⁶These were the men chosen from the Israelite community. They were the leaders of their fathers' tribes; the heads of the families of Israel.

¹⁷Moses and Aaron summoned these men who had been selected by name.

¹⁸They had all the Israelites gather together on the first day of the second month, and recorded the people's genealogy according to their tribe and family, and counted up the names of all those aged twenty or older,