Numbers 10:17-20

17Then the tabernacle was taken down, and the Gershonites and Merarites, who carried it, set out. 18The divisions of the camp of Reuben went next, under their standard. Elizur son of Shedeur was in command. 19Shelumiel son of Zurishaddai was over the division of the tribe of Simeon, 20and Eliasaph son of Deuel was over the division of the tribe of Gad.