Final answer:
John the Baptist reveals Jesus as the Lamb of God to Israel through the act of baptizing Him, which serves as the divine revelation of Jesus as the Messiah and signifies His role as the sacrificial lamb for humanity's sins.
Step-by-step explanation:
John the Baptist reveals Jesus as the Lamb of God through the act of baptizing Him. This pivotal event, known as The Baptism of Christ, is detailed in the Gospels of Matthew, Mark, and Luke. During the baptism, which occurs in the Jordan River, the heavens open, the Holy Spirit descends upon Jesus in the form of a dove, and a voice from heaven proclaims Jesus as God's beloved Son. This act of baptism by John not only served as a symbolic cleansing but also as the divine revelation to Israel that Jesus was indeed the awaited Messiah, whose sacrificial role was prefigured by the lamb in Jewish ritual sacrifices. The image of the sacrificial lamb is a powerful symbol in Christianity, representing Jesus's sacrifice for the sins of humanity.