It happened, while Yisra'el lived in that land, that Re'uven went and lay with Bilhah, his father's concubine, and Yisra'el heard of it. Now the sons of Ya`akov were twelve.
Of the children of Dan, their generations, by their families, by their fathers' houses, according to the number of the names, from twenty years old and upward, all who were able to go forth to war;
He gave him the covenant of circumcision. So Avraham became the father of Yitzchak, and circumcised him the eighth day. Yitzchak became the father of Ya`akov, and Ya`akov became the father of the twelve patriarchs.
