Galatians 4:26

However, the son by the servant was born according to the flesh, but the son by the free woman was born through promise.

These things contain an allegory, for these are two covenants. One is from Mount Sinai, bearing children to bondage, which is Hagar.

For this Hagar is Mount Sinai in Arabia, and answers to the Jerusalem that exists now, for she is in bondage with her children.

For it is written,

“Rejoice, you barren who don’t bear.

Break out and shout, you who don’t travail.

For the desolate women have more children than her who has a husband.”

Now we, brothers, as Isaac was, are children of promise.

But as then, he who was born according to the flesh persecuted him who was born according to the Spirit, so also it is now.