Bible Verses About Reuben: Commits incest with one of his father's concubines, and, in consequence, forfeits the birthright

It was while Isra'el was living in that land that Re'uven went and slept with Bilhah his father's concubine, and Isra'el heard about it. Ya'akov had twelve sons.

Though superior in vigor and power you are unstable as water, so your superiority will end, because you climbed into your father's bed and defiled it -he climbed onto my concubine's couch!

The sons of Re'uven the firstborn of Isra'el - he was the firstborn, but because he defiled his father's bed, his birthright was given to the sons of Yosef the son of Isra'el, though not in such a way as for him to be regarded in the genealogy as the firstborn.