Then one of them said, “I will come again in the spring. At that time your wife Sarah will have a son.” Sarah was listening in the tent and heard these things.
God said, “No, I said that your wife Sarah will have a son. You will name him Isaac. I will make my agreement with him that will continue forever with all his descendants.
Abraham’s son from the slave woman was born in the normal human way. But the son from the free woman was born because of the promise God made to Abraham.
But the angel said to him, “Zechariah, don’t be afraid. Your prayer has been heard by God. Your wife Elizabeth will give birth to a baby boy, and you will name him John.