Gen 17:16, Gen 22:17, Rom 9:10
Christ came as the descendant of Isaac and Rebekah.
Gen 24:59 And they sent away Rebekah their sister, and her nurse, and Abraham's servant, and his men. 60 And they blessed Rebekah, and said unto her, Thou art our sister, be thou the mother of thousands of millions, and let thy seed possess the gate of those which hate them. 67 And Isaac brought her into his mother Sarah's tent, and took Rebekah, and she became his wife; and he loved her: and Isaac was comforted after his mother's death.
Gen 17:16 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.
Gen 22:17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies;
Rom 9:10 And not only this; but when Rebecca also had conceived by one, even by our father Isaac;