Final answer:
John the Baptist referred to Jesus as 'the Lamb of God' when he saw Jesus approaching, symbolizing Jesus's role in salvation according to Christian belief.
Step-by-step explanation:
When John the Baptist saw Jesus coming toward him, he proclaimed to the people, 'Behold, the Lamb of God, who takes away the sin of the world!' This declaration identifies Jesus as the sacrificial lamb in Christian theology, a figure meant to bear the sins of humanity and offer salvation. This scene is a pivotal moment in the New Testament, highlighting John the Baptist's recognition of Jesus's spiritual significance and his role in the coming Christian narrative.