21 And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken.

⁶ The words of the Lord are pure words: as silver tried in a furnace of earth, purified seven times.

¹⁰ 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.

¹⁴ 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.

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.

² In hope of eternal life, which God, that cannot lie, promised before the world began;

²³ But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.

³⁵ Heaven and earth shall pass away, but my words shall not pass away.

²⁸ Now we, brethren, as Isaac was, are the children of promise.

¹⁷ (As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were.

¹⁸ Who against hope believed in hope, that he might become the father of many nations, according to that which was spoken, So shall thy seed be.

¹⁹ And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah's womb:

²⁰ He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;