Numbers 2:10-16

10“The divisions of Reuben, Simeon, and Gad are to camp on the south side of the Tabernacle, beneath their family banners. These are the names of the tribes, their leaders, and the numbers of their registered troops: Reuben Elizur son of Shedeur 46,500

12Simeon Shelumiel son of Zurishaddai 59,300

14Gad Eliasaph son of Deuel 45,650

16So the total of all the troops on Reuben’s side of the camp is 151,450. These three tribes will be second in line whenever the Israelites travel.