Variantly: "And I shall see the blood": I shall see the "blood" of the binding of Isaac, as it is written (Genesis 22:14) "And Abraham called the name of the place 'The L–rd will see.'" And elsewhere it is written (I Chronicles 21:15) "But as he was about to destroy, the L–rd saw and He repented Himself of the evil." What did He see? The blood of the binding of Isaac.