Galatians 4:26 WEB

²⁴  These things contain an allegory, for these are two covenants. One is from Mount Sinai, bearing children to bondage, which is Hagar.

²⁵  For this Hagar is Mount Sinai in Arabia, and answers to the Jerusalem that exists now, for she is in bondage with her children.

²⁶  But the Jerusalem that is above is free, which is the mother of us all.

²⁷  For it is written, 'Rejoice, you barren who don't bear. Break forth and shout, you that don't travail. For more are the children of the desolate than of her who has a husband.'

²⁸  Now we, brothers, as Isaac was, are children of promise.