O KEY OF DAVID, and Sceptre of the House of Israel, who opens and no man shuts, who shuts and no man opens: COME, and bring forth the captive from his prison, he who sits in darkness and in the shadow of death.
When John the Baptist sat in Herod's prison he sent some of his disciples to Jesus to ask,"Are you he who is to come or should we look for another?" It was a good question, after all John was a captive and the Messiah was to set prisoner's free. Jesus instructed John's disciples to return and tell John what they saw, the blind seeing, the deaf hearing, the lame walking...in other words the fulfillment of prophecy.
To Peter he would give the power of the keys...to forgive sins, to unleash the real imprisonment that we suffer from in our fallen state. How many of us remain in Herod's prison suffering the effects of evil done to us and the good news of the Gospel falls on our deaf ears, we cannot see it with our blind eyes, we cannot move from where we our with our lame legs?
We need to be rescued from the "shadow of death", to be freed, both forgiven and forgiving. O Key of David, Come!