Hebrews 11:11

Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.

Galatians 4:22

For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.

Genesis 17:21

But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.

Genesis 18:10

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.

Genesis 17:19

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.

Genesis 18:14

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.

Acts 7:8

And he gave him the covenant of circumcision: and so {Abraham} begat Isaac, and circumcised him the eighth day; and Isaac {begat} Jacob; and Jacob {begat} the twelve patriarchs.

Luke 1:36

And, behold, thy cousin Elisabeth, she hath also conceived a son in her old age: and this is the sixth month with her, who was called barren.