Genesis 18:11

And she said, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

Now Abraham was old, advanced in age; and Yahweh had blessed Abraham in every way.

And without becoming weak in faith he contemplated his own body, now as good as dead since he was about a hundred years old, and the deadness of Sarah’s womb;

But the son by the servant-woman had been born according to the flesh, while the son by the free woman through the promise.

By faith even Sarah herself received ability to conceive, even beyond the proper time of life, since she regarded Him faithful who had promised.

Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it.