Numbers 1:3-5

New King James Version

³ from ^(A)twenty years old and above—all who are able to go to war in Israel. You and Aaron shall number them by their armies. ⁴ And with you there shall be a man from every tribe, each one the head of his father’s house.

⁵ “These are the names of the men who shall stand with you: from Reuben, Elizur the son of Shedeur;