The next day he saw Jesus coming toward him, and said, “Behold, the Lamb of God, who takes away the sin of the world!”John 1:29, ESV
After John the Baptist had recognized Jesus as the Messiah, he referred to Jesus as the Lamb twice. In John 1:29, John the Baptist pointed at Jesus and proclaimed that: “Behold, the Lamb of God, who takes away the sin of the world!” And again a few verses later: “Behold, the Lamb of God!” (John 1:36). The two disciples who were standing with John knew that this was significant because they immediately left John to follow after Jesus.
Since then, Christians have been enamored by Jesus’s role as the Lamb of God, regularly featured in psalms and art. Our modern worship music is saturated with lambs. And for a good reason. The Lamb of God is one of the most distinguished titles of Jesus that describe his work on the cross, which was frequently prophesied in the Old Testament. When John’s disciples and the Jews first heard this, they could have been reminded of several texts.