Galatians 4:21 ASV

¹⁹  My little children, of whom I am again in travail until Christ be formed in you--

²⁰  but I could wish to be present with you now, and to change my tone; for I am perplexed about you.

²¹  Tell me, ye that desire to be under the law, do ye not hear the law?

²²  For it is written, that Abraham had two sons, one by the handmaid, and one by the freewoman.

²³  Howbeit the 'son' by the handmaid is born after the flesh; but the 'son' by the freewoman 'is born' through promise.