Look at Abraham, your father, and Sarah, who gave you birth. When I summoned him, he was a lone individual, but I blessed him and gave him numerous descendants.
From the descendants of Judah: According to the records of their clans and families, all the males twenty years old or older who could serve in the army were listed by name.
Then God gave Abraham the covenant of circumcision, and so he became the father of Isaac and circumcised him when he was eight days old, and Isaac became the father of Jacob, and Jacob of the twelve patriarchs.
By faith, even though Sarah herself was barren and he was too old, he received the ability to procreate, because he regarded the one who had given the promise to be trustworthy.