When John the Baptist stepped forward in John 1:29 and introduced Jesus as the Lamb of God, he did so as the final Old Testament prophet, the son of a priest, and as the chosen forerunner of Christ. He identified Jesus as the Passover Lamb of God, how powerful, complete and transforming is that truth. Think of the dramatic sequence God had planned just on the day of Christ's crucifixion. On the day Christ died on the Cross - for our sins, it was the fourteenth day of Abib, A.D. 33.
At the third hour (9:00 AM), Israel's high priest tied the Passover lamb to the altar for sacrifice. At that exact moment outside the city walls of Jerusalem, Jesus, the Lamb of God, was nailed to the cross.
For six hours both the Passover lamb and Jesus the Lamb of God, awaited death. Finally, at the ninth hour (3:00 PM), the high priest ascended the altar in the temple and sacrificed the Passover lamb.
At that exact moment from the Cross Christ's words thundered out over the city of Jerusalem, "It is finished!"
On Calvary's stark mountain, God the Father, the final High Priest of all creation, placed His holy hand on the head of His only begotten Son, allowing the total sin of the world to descend upon Jesus. Barely able to lift His blood-spattered face toward heaven, Jesus shouted in triumph, "It is finished!" (John 19:30).
Jesus as the Lamb of God summarizes God's Word completely. It is the greatest summary of Who Christ WAS, What HE DID, and how we participate.
Taken from "Jesus is the Lamb of God" by Discover the Book Ministries (used by permission).