Galatians 4:25-27 New International Version (NIV)

25. Now Hagar stands for Mount Sinai in Arabia and corresponds to the present city of Jerusalem, because she is in slavery with her children.

26. But the Jerusalem that is above is free, and she is our mother.

27. For it is written: “Be glad, barren woman, you who never bore a child; shout for joy and cry aloud, you who were never in labor; because more are the children of the desolate woman than of her who has a husband.”

Galatians 4