“But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.”
King James Version (KJV)
4:23 Was born after the flesh - In a natural way. By promise - Through that supernatural strength which was given Abraham in consequence of the promise.
Ga 4:23 He [who was] of the bondwoman was born after the flesh. The son of the bondwoman was born in the ordinary course of nature. He of the freewoman [was] by promise. The son of Sarah was a child of promise, born when she was long past the age of bearing children. See Ge 18:1,14 21:1,2 Heb 11:11.