John Gill discusses the prophetic office of the Messiah, asserting that Jesus is the prophet foretold in Deuteronomy 18:15. He explores the identity of the Messiah's forerunner, identifying John the Baptist as the one who prepared the way for Jesus. Gill emphasizes the prophetic work of Jesus, including preaching the gospel, performing miracles, and foretelling future events, all of which affirm His role as the Messiah. He also highlights the significance of Galilee as the primary location for Jesus' ministry and notes the expected rejection of His message by many. Ultimately, Gill illustrates how the prophecies concerning the Messiah were fulfilled in Jesus, underscoring His unique position as the ultimate prophet.