Abraham had a concubine named Keturah, who bore him six sons: Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. Jokshan had two sons: Sheba and Dedan.

From Abraham to King David, the following ancestors are listed: Abraham, Isaac, Jacob, Judah and his brothers; then Perez and Zerah (their mother was Tamar), Hezron, Ram, Amminadab, Nahshon, Salmon, Boaz (his mother was Rahab), Obed (his mother was Ruth), Jesse, and King David.

the son of Jacob, the son of Isaac, the son of Abraham, the son of Terah, the son of Nahor,

Then God gave to Abraham the ceremony of circumcision as a sign of the covenant. So Abraham circumcised Isaac a week after he was born; Isaac circumcised his son Jacob, and Jacob circumcised his twelve sons, the famous ancestors of our race.