Leah conceived and gave birth to a son, and named him Reuben, for she said, “Because the Lord has seen my affliction; surely now my husband will love me.”
And it came about, while Israel was living in that land, that Reuben went and slept with his father’s concubine Bilhah, and Israel heard about it. Now there were twelve sons of Jacob—
Now the sons of Reuben, the firstborn of Israel (for he was the firstborn, but because he defiled his father’s bed, his birthright was given to the sons of Joseph, the son of Israel; so he is not enrolled in the genealogy according to the birthright.
Now the sons of Reuben, Israel’s firstborn, their descendants by their families, by their fathers’ households, according to the number of names, head by head, every male from twenty years old and upward, whoever was able to go to war,
On the contrary, he shall acknowledge the firstborn, the son of the unloved wife, by giving him a double portion of everything that he owns, for he was the beginning of his strength; to him belongs the right of the firstborn.