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.
And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.
And the LORD appeared unto him, and said, Go not down into Egypt; dwell in the land which I shall tell thee of:
Sojourn in this land, and I will be with thee, and will bless thee; for unto thee, and unto thy seed, I will give all these countries, and I will perform the oath which I sware unto Abraham thy father;
And I will make thy seed to multiply as the stars of heaven, and will give unto thy seed all these countries; and in thy seed shall all the nations of the earth be blessed;
Because that Abraham obeyed my voice, and kept my charge, my commandments, my statutes, and my laws.
And the LORD appeared unto him the same night, and said, I [am] the God of Abraham thy father: fear not, for I [am] with thee, and will bless thee, and multiply thy seed for my servant Abraham's sake.
Remember Abraham, Isaac, and Israel, thy servants, to whom thou swarest by thine own self, and saidst unto them, I will multiply your seed as the stars of heaven, and all this land that I have spoken of will I give unto your seed, and they shall inherit [it] for ever.
1 Chronicles 16:16
[Even of the covenant] which he made with Abraham, and of his oath unto Isaac;
Is any thing too hard for the LORD? At the time appointed I will return unto thee, according to the time of life, and Sarah shall have a son.
And the LORD said unto Abraham, Wherefore did Sarah laugh, saying, Shall I of a surety bear a child, which am old?
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?
And Abraham said unto God, O that Ishmael might live before thee!
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.
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.
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard [it] in the tent door, which [was] behind him.
Now Abraham and Sarah [were] old [and] well stricken in age; [and] it ceased to be with Sarah after the manner of women.
Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?
Neither, because they are the seed of Abraham, [are they] all children: but, In Isaac shall thy seed be called.