Luke 7: 18 - 23
18 The disciples of John told him of all these things.
19 And John, calling to him two of his disciples, sent them to the Lord, saying, "Are you he who is to come, or shall we look for another?"
20 And when the men had come to him, they said, "John the Baptist has sent us to you, saying, `Are you he who is to come, or shall we look for another?'"
21 In that hour he cured many of diseases and plagues and evil spirits, and on many that were blind he bestowed sight.
22 And he answered them, "Go and tell John what you have seen and heard: the blind receive their sight, the lame walk, lepers are cleansed, and the deaf hear, the dead are raised up, the poor have good news preached to them.
23 And blessed is he who takes no offense at me."
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Upon receiving John's disciples and hearing John's questions, Christ shows signs of the Messiah that are foretold in Isaiah 35 and 61: the blind see, the deaf hear, the lame are cured, (Isaiah 35) and the poor hear the good news (Isaiah 61).
One question I've had in the past on this is why did John send the disciples with questions? My personal answer is that he didn't doubt Christ at all, but he wanted his disciples to see him first hand.
