Galatians 4:22-28

22For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.

23But one, the son by the slave woman, was born by natural descent, while the other, the son by the free woman, was born through the promise.

24These things may be treated as an allegory, for these women represent two covenants. One is from Mount Sinai bearing children for slavery; this is Hagar.

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

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

27For it is written: “Rejoice, O barren woman who does not bear children; break forth and shout, you who have no birth pains, because the children of the desolate woman are more numerous than those of the woman who has a husband.”

28But you, brothers and sisters, are children of the promise like Isaac.