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.
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.
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
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.
By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son,