What does John 18:5 mean?
Jesus' enemies needed to conspire with Judas (John 13:2–3; Matthew 26:14–16) for two reasons. First was inside information: knowing where to find Jesus away from a supportive Jerusalem crowd (John 11:57). Second was identification: clearly pointing out the right person to the arresting soldiers, for which Judas has arranged a sign (Luke 22:47–48). Contrary to what they expected, however, Christ has voluntarily approached the group and asked who they have come for (John 18:1–4).The response Christ gives here parallels His earlier "I am" statements (John 6:35; 8:12; 10:7, 11; 11:25; 14:6; 15:1). All of these invoke the way God identified Himself to Moses (Exodus 3:14). The claim is a declaration of God's necessary, absolute existence. Used here, it also becomes a final proof that Jesus is submitting to this experience (Philippians 2:8), not being overpowered. The divine force of His words will knock the arresting men to the ground (John 18:6), only for Christ to agree to be taken into custody (John 18:8, 12).