Genesis 29:32
And Leah conceived, and bare a son, and she called his name Reuben: for she said, Surely the LORD hath looked upon my affliction; now therefore my husband will love me.
Genesis 49:3
Reuben, thou art my firstborn, my might, and the beginning of my strength, the excellency of dignity, and the excellency of power:
Genesis 49:4
Unstable as water, thou shalt not excel; because thou wentest up to thy father's bed; then defiledst thou it: he went up to my couch.
Joshua 13:15-21
15
And Moses gave unto the tribe of the children of Reuben inheritance according to their families.
16
And their coast was from Aroer, that is on the bank of the river Arnon, and the city that is in the midst of the river, and all the plain by Medeba;
17
Heshbon, and all her cities that are in the plain; Dibon, and Bamothbaal, and Bethbaalmeon,
18
And Jahazah, and Kedemoth, and Mephaath,
19
And Kirjathaim, and Sibmah, and Zarethshahar in the mount of the valley,
20
And Bethpeor, and Ashdothpisgah, and Bethjeshimoth,
21
And all the cities of the plain, and all the kingdom of Sihon king of the Amorites, which reigned in Heshbon, whom Moses smote with the princes of Midian, Evi, and Rekem, and Zur, and Hur, and Reba, which were dukes of Sihon, dwelling in the country.