Galatians 4:26-28

But the other woman, Sarah, represents the heavenly Jerusalem. She is the free woman, and she is our mother. As Isaiah said, “Rejoice, O childless woman, you who have never given birth! Break into a joyful shout, you who have never been in labor! For the desolate woman now has more children than the woman who lives with her husband!” And you, dear brothers and sisters, are children of the promise, just like Isaac.