Final answer:
In the Gospel of John, John the Baptist refers to Jesus as the Lamb of God when he sees him walking by. This reference is part of John recognizing Jesus's messianic role, and the event is deeply symbolic in Christian tradition, often depicted in religious texts and art.
Step-by-step explanation:
The passage where John the Baptist sees Jesus walking by is not provided here, but traditionally, in the scripture, when John sees Jesus, he identifies him as the Lamb of God. Specifically, in the Gospel of John 1:36 it says, "And looking at Jesus as he walked, he saith, Behold the Lamb of God!" This testimony is part of the religious texts that describe the beginning of Jesus's ministry and the acknowledgment of his role as the Messiah by John the Baptist. The Baptism of Christ, another significant event involving both figures, is a rich subject depicted in religious art and text, symbolizing the revelation of Jesus as God's son with John as the witness and participant.
In various artworks and scriptural recounts, significant symbols such as the presence of the Holy Spirit in the form of a dove, the voice of God, and the imagery of the Jordan River personified are used to represent the profound nature of this event. References to John the Baptist's words about the coming of Jesus and the importance of repentance and bearing good fruit are also portrayed with metaphors like the ax and the root of the trees.