Galatians 4:25-29

Now this Hagar is Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is enslaved with her children.

But the Jerusalem above is free; she is our mother.

For it is written: “Rejoice, infertile one, you who do not give birth; Break forth and shout, you who are not in labor; For the children of the desolate one are more numerous Than those of the one who has a husband.”

And you, brothers and sisters, like Isaac, are children of promise.

But as at that time the son who was born according to the flesh persecuted the one who was born according to the Spirit, so it is even now.