Nebel A1, Filon D, Weiss DA, Weale M, Faerman M, Oppenheim A, Thomas MG.
Hum Genet. 2000 Dec;107(6):630-41.
16 And I will bless her, and give thee a son also of her: yea, I will bless her, and she shall be a mother of nations; kings of people shall be of her.
17 Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
18 And Abraham said unto God, O that Ishmael might live before thee!
19 And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
20 And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.
21 But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year."
Note: According to the Bible: The Jewish people are descended from Issac and the Arabic people from Ishmael. Abraham was the father of both boys; Issac by Sarah and Ishmael by Hagar. (See Genesis 16:1 Now Sarai Abram's wife bare him no children: and she had an handmaid, an Egyptian, whose name was Hagar. 2 And Sarai said unto Abram, Behold now, the Lord hath restrained me from bearing: I pray thee, go in unto my maid; it may be that I may obtain children by her. And Abram hearkened to the voice of Sarai.)" Yet Sarah did have a child that was named Issac. See Genesis 21:1 "And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken.2 For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him. 3 And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac."