Numbers 2:16

2:16 All those numbered of the camp of Reuben, according to their divisions, are 151,450. They will travel second.

Numbers 16:1

The Rebellion of Korah

16:1 Now Korah son of Izhar, the son of Kohath, the son of Levi, and Dathan and Abiram, the sons of Eliab, and On son of Peleth, who were Reubenites, took men

Numbers 32:2

32:2 the Gadites and the Reubenites came and addressed Moses, Eleazar the priest, and the leaders of the community. They said,

Numbers 32:25

32:25 So the Gadites and the Reubenites replied to Moses, “Your servants will do as my lord commands.

Numbers 32:31

32:31 Then the Gadites and the Reubenites answered, “Your servants will do what the Lord has spoken.