Jubilees 25:3

And now, my son, hearken to my voice, and do the will of thy mother, and do not take thee a wife of the daughters of this land, but only of the house of my father, and of my father's kindred. Thou shalt take thee a wife of the house of my father, and the Most High God will bless thee, and thy children shall be a righteous generation and a holy seed.'