Genesis 29:32

29:32 So Leah became pregnant and gave birth to a son. She named him Reuben, for she said, “The Lord has looked with pity on my oppressed condition. Surely my husband will love me now.”

Genesis 49:3-4

49:3 Reuben, you are my firstborn,

my might and the beginning of my strength,

outstanding in dignity, outstanding in power.

49:4 You are destructive like water and will not excel,

for you got on your father’s bed,

then you defiled it – he got on my couch!

Joshua 13:15-21

13:15 Moses assigned land to the tribe of Reuben by its clans. 13:16 Their territory started at Aroer (on the edge of the Arnon Valley) and included the city in the middle of the valley, the whole plain of Medeba, 13:17 Heshbon and all its surrounding cities on the plain, including Dibon, Bamoth Baal, Beth Baal Meon, 13:18 Jahaz, Kedemoth, Mephaath, 13:19 Kiriathaim, Sibmah, Zereth Shahar on the hill in the valley, 13:20 Beth Peor, the slopes of Pisgah, and Beth Jeshimoth. 13:21 It encompassed all the cities of the plain and the whole realm of King Sihon of the Amorites who ruled in Heshbon. Moses defeated him and the Midianite leaders Evi, Rekem, Zur, Hur, and Reba (they were subjects of Sihon and lived in his territory).