" When He spoke, “I am he” (v. 6), a designation He had used before to declare Himself God (8:28, 58; cf. 6:35; 8:12; 10:7, 9, 11, 14; 11:25; 14:6; 15:1, 5), they were jolted backward and to the ground (v. 6). This power display and the authoritative demand not to take the disciples were of immense significance, as the next verse indicates. "
― John F. MacArthur Jr. , The NIV MacArthur Study Bible