Numbers 1:2-6

²Take the sum of all the congregation of Israel according to their kindred, according to the houses of their fathers’ families, according to their number by their names, according to their heads: every male

³from twenty years old and upward, everyone that goes forth in the forces of Israel, take account of them with their strength; thou and Aaron take account of them.

⁴And with you there shall be each one of the rulers according to the tribe of each: they shall be according to the houses of their families.

⁵And these are the names of the men who shall be present with you; of the tribe of Reuben, Elizur the son of Shedeur.

⁶Of Simeon, Shelumiel the son of Zurishaddai.