Let your thoughts be turned to Abraham, your father, and to Sarah, who gave you birth: for when he was but one, my voice came to him, and I gave him my blessing, and made him a great people.
The generations of the sons of Judah were numbered by their families and their fathers' houses, every male of twenty years old and over who was able to go to war;
And he made with him the agreement of which circumcision was the sign. And so Abraham had a son, Isaac, and gave him circumcision on the eighth day; and Isaac had a son, Jacob, and Jacob was the father of the twelve heads of the families of Israel.