On the contrary, he shall recognize as his firstborn the son of the unloved wife, giving him a double share of whatever he happens to own, since he is the first fruits of his manhood, and to him belong the rights of the firstborn. The Stubborn and Rebellious Son.
The sons of Reuben, the firstborn of Israel. (He was indeed the firstborn, but because he defiled the couch of his father his birthright was given to the sons of Joseph, son of Israel, so that he is not listed in the family records according to his birthright.
Of the descendants of Reuben, the firstborn of Israel, registered individually by name and lineage according to their clans and ancestral houses, every male of twenty years or more, everyone fit for military service:
Reuben, the firstborn of Israel. The descendants of Reuben by their clans were: through Hanoch, the clan of the Hanochites; through Pallu, the clan of the Palluites;
While Israel was encamped in that region, Reuben went and lay with Bilhah, his father’s concubine. When Israel heard of it, he was greatly offended. The sons of Jacob were now twelve.