Galatians 4:27-31

27For it is written: “Rejoice, O barren woman who bears no children. Break forth and shout, you who suffer no labor pains. For more are the children of the desolate than of the one who has a husband.”

28Now you, brothers and sisters—like Isaac, you are children of promise.

29But just as at that time the one born according to the flesh persecuted the one born according to the Ruach, so it is now.

30But what does the Scripture say? “Drive out the slave woman and her son, for the son of the slave woman shall not inherit with the son” of the free woman.

31So then, brothers and sisters, we are not children of the slave woman but of the free woman.