Numbers 1:3-5

New Catholic Bible

³ You and Aaron will count them, company by company, each one who is twenty years and older and is able to go to war in Israel. ⁴ A man from every tribe,^[a] the head of his clan, will accompany you.

Assistants to Moses Named. ⁵ “These are the names of the men who will accompany you: from the tribe of Reuben, Elizur, the son of Shedeur;