Galatians 4:26-27

26But the Jerusalem above [that is, the way of faith, represented by Sarah] is free; she is our mother.

27For it is written [in the Scriptures], “Rejoice, o barren woman who has not given birth; Break forth into a [joyful] shout, you who are not in labor; For the desolate woman has many more children Than she who has a husband.”