Reuben, son of Israel (Jacob) - The Man and His House

  Reuben (Hebrew: רְאוּבֵן‎, Modern Re'uven Tiberian Rəʾûḇēn) is the first and eldest son of Jacob (latter named as Israel) with Leah. He is also the father of the Israelite Tribe of Reuben and the Reubenites.
  The name Reuben means "see a son."

Genesis 29:32
³² And Leah conceived, and bare a son, and she called his name Reuben (Reuven): for she said, Surely the Yah hath looked upon my affliction; now therefore my husband will love me.

The prophetic blessing of Jacob to Reuben, prior to his death:

Genesis 49:1-4
¹ And Jacob (Ya’akov) called unto his sons, and said, Gather yourselves together, that I may tell you that which shall befall you in the last days. ² Gather yourselves together, and hear, ye sons of Jacob (Ya’akov); and hearken unto Israel your father. ³ Reuben (Reuven), thou art my firstborn, my might, and the beginning of my strength, the excellency of dignity, and the excellency of power: 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.

The Tribe of Reuben

  The Tribe of Reuben (Hebrew: שֵׁבֶט רְאוּבֵן, Modern Shevet Re'uven Tiberian Šḗḇeṭ Rəʼûḇēn) is one of the Tribes of Israel.

Joshua 13:15-23
¹⁵ And Moses (Moshe) gave unto the tribe of the children of Reuben (Reuven) 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 Jahaza, 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. ²² Balaam also the son of Beor, the soothsayer, did the children of Israel slay with the sword among them that were slain by them. ²³ And the border of the children of Reuben was Jordan, and the border thereof. This was the inheritance of the children of Reuben after their families, the cities and the villages thereof.