Brothers and sisters,
Tell me, you who desire to be subject to the law, will you not listen to the law? For it is written that Abraham had two sons, one by a slave woman and the other by a free woman. One, the child of the slave, was born according to the flesh; the other, the child of the free woman, was born through the promise. Now this is an allegory: these women are two covenants. One woman, in fact, is Hagar, from Mount Sinai, bearing children for slavery.
Now Hagar is Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children. But the other woman corresponds to the Jerusalem above; she is free, and she is our mother.
For it is written, “Rejoice, you childless one, you who bear no children, burst into song and shout, you who endure no birth pangs; for the children of the desolate woman are more numerous than the children of the one who is married.”
Now you, my friends, are children of the promise, like Isaac. But just as at that time the child who was born according to the flesh persecuted the child who was born according to the Spirit, so it is now also. But what does the scripture say? “Drive out the slave and her child; for the child of the slave will not share the inheritance with the child of the free woman.” So then, friends, we are children, not of the slave but of the free woman. For freedom Christ has set us free. Stand firm, therefore, and do not submit again to a yoke of slavery.
Gal 4:21- 5:1
Now the time came for Elizabeth to give birth, and she bore a son. Her neighbours and relatives heard that the Lord had shown his great mercy to her, and they rejoiced with her. On the eighth day they came to circumcise the child, and they were going to name him Zechariah after his father. But his mother said, “No; he is to be called John.” They said to her, “None of your relatives has this name.” Then they began motioning to his father to find out what name he wanted to give him. He asked for a writing tablet and wrote, “His name is John.” And all of them were amazed. Immediately his mouth was opened and his tongue freed, and he began to speak, praising God.
Fear came over all their neighbours, and all these things were talked about throughout the entire hill country of Judea. All who heard them pondered them and said, “What then will this child become?” For, indeed, the hand of the Lord was with him.
Lk 1: 57-66