Numbers 10:18-20

¹⁸Then the flag of the children of Reuben went forward with their armies: and at the head of his army was Elizur, the son of Shedeur.

¹⁹And at the head of the army of the children of Simeon was Shelumiel, the son of Zurishaddai.

²⁰At the head of the army of the children of Gad was Eliasaph, the son of Reuel.