Numbers 2:10-13

“On the south side shall be the standard of the camp of Reuben, by their armies; and Elizur the son of Shedeur shall lead the sons of Reuben, and his army as numbered totaled 46,500. Those who camp next to Reuben [on the south side] shall be the tribe of Simeon; and Shelumiel the son of Zurishaddai shall lead the sons of Simeon, and his army as numbered totaled 59,300.