The next day, he saw Jesus coming to him, and said, "Behold, the Lamb of God, who takes away the sin of the world!

 It was at his baptism that the Spirit came down upon Jesus with power. We must remember that at this time the Christian doctrine of the Spirit had not yet come into being. We have to wait for the last chapters of John's gospel and for Pentecost for that to emerge. When John the Baptist spoke of the Spirit coming upon Jesus, he must have been thinking in Jewish terms. What then was the Jewish idea of the Spirit? 