Numbers 1:2-6

²Take the full number of the children of Israel, by their families, and by their fathers' houses, every male by name;

³All those of twenty years old and over, who are able to go to war in Israel, are to be numbered by you and Aaron.

⁴And to give you help, take one man from every tribe, the head of his father's house.

⁵These are the names of those who are to be your helpers: from Reuben, Elizur, the son of Shedeur;

⁶From Simeon, Shelumiel, the son of Zurishaddai;