Now the sons of Reuben the firstborn of Israel—he was indeed the firstborn, but because he defiled his father’s bed, his birthright was given to the sons of Joseph, the son of Israel, so that the genealogy is not listed according to the birthright;
These are the heads of their fathers’ houses: The sons of Reuben, the firstborn of Israel, were Hanoch, Pallu, Hezron, and Carmi. These are the families of Reuben.
So Leah conceived and bore a son, and she called his name Reuben; for she said, “The Lord has surely looked on my affliction. Now therefore, my husband will love me.”
Now the children of Reuben, Israel’s oldest son, their genealogies by their families, by their fathers’ house, according to the number of names, every male individually, from twenty years old and above, all who were able to go to war:
“Take a census of the people from twenty years old and above, just as the Lord commanded Moses and the children of Israel who came out of the land of Egypt.”
And it happened, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father’s concubine; and Israel heard about it. Now the sons of Jacob were twelve: