Genesis 18:10

Luke 1:13

And the angel said to him, "Do not be afraid, Zechariah, for your prayer has been heard. Your wife Elizabeth will bear you a son, and you are to name him John.

Romans 9:8-9

That is to say, it is not his physical descendants who are children of God, but his descendants born in fulfilment of the promise who are considered his true posterity.

Galatians 4:23

But the child of the slave-girl was born in the ordinary course of nature, while the child of the free woman was born in fulfilment of the promise.

Galatians 4:28

Now we, brothers, are like Isaac, children born in fulfilment of the promise.

Treasury of Scripture Knowledge

Summary

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.

Lo, sarah

Luke 1:13

Romans 9:8

Galatians 4:23

Bible References

Lo, sarah

And the angel said to him, "Do not be afraid, Zechariah, for your prayer has been heard. Your wife Elizabeth will bear you a son, and you are to name him John.

That is to say, it is not his physical descendants who are children of God, but his descendants born in fulfilment of the promise who are considered his true posterity.

But the child of the slave-girl was born in the ordinary course of nature, while the child of the free woman was born in fulfilment of the promise.