Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is a hundred years old? and shall Sarah, that is ninety years old, bear?
All Commentaries on Genesis 17:17 Go To Genesis 17
Ephrem The Syrian
AD 373
Now Abraham was not guilty of any doubt by his laughter, for he showed his love toward Ishmael in what he said. He had clung to this hope for twentyfive years. Abraham had manifested his faith in every vision that had come to him. However great his contest with barrenness became, he manifested the victory of his faith. But when old age was added to the barrenness, he laughed in his heart. That his Lord would do these two things for him was a marvel to him.