By faith Sarah herself also received the ability to conceive seed, and she bore a child when she was past the age, because she judged Him faithful who had promised.
But the woman conceived and bore a son at that season, at the time that Elisha had told her.
And behold, your cousin Elizabeth has also conceived a son in her old age. And this is the sixth month with her who was declared barren.
So those who are the children of the flesh are not the children of God, but the children of the promise are counted as descendants.
But he who was of the slave woman was born according to the flesh, but he of the free woman through the promise.
Let us firmly hold the confession of our hope without wavering, for He who promised is faithful.