Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a man who is a hundred years old? Can Sarah give birth at the age of ninety?”
Jewish Publication Society of America Version (JPS1917) - Genesis 17:17 >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?'