Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
Abraham fell upon his face, and laughed. It was not the sneer of unbelief, but a smile of delight at the prospect of so improbable an event (Romans 4:20); he fully believed the word of God: there was humility blended with wonder and joy. This is what our Lord alluded to, John 8:56. Since Abraham saw heaven in the promise of Canaan, so he saw Christ in the promise of Isaac (laughter).