And it came to pass, while Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine: and Israel heard of it. Now the sons of Jacob 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 that were able to go forth to war;
And he gave him the covenant of circumcision: and so Abraham begat Isaac, and circumcised him the eighth day; and Isaac begat Jacob, and Jacob the twelve patriarchs.