Matthew 8:5-13 (NIV)
When Jesus had entered Capernaum, a centurion came to him, asking for help. “Lord,” he said, “my servant lies at home paralyzed and in terrible suffering.” Jesus said to him, “I will go and heal him.” The centurion replied, “Lord, I do not deserve to have you come under my roof. But just say the word, and my servant will be healed. For I myself am a man under authority, with soldiers under me. I tell this one, Go,' and he goes; and that one,Come,’ and he comes. I say to my servant, `Do this,’ and he does it.” When Jesus heard this, he was astonished and said to those following him, “I tell you the truth, I have not found anyone in Israel with such great faith. I say to you that many will come from the east and the west, and will take their places at the feast with Abraham, Isaac and Jacob in the kingdom of heaven. But the subjects of the kingdom will be thrown outside, into the darkness, where there will be weeping and gnashing of teeth.” Then Jesus said to the centurion, “Go! It will be done just as you believed it would.” And his servant was healed at that very hour.

Matthew 16:18-19 (NIV)
And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it. I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.”

Luke 10:18-19 (NIV)
He replied, “I saw Satan fall like lightning from heaven. I have given you authority to trample on snakes and scorpions and to overcome all the power of the enemy; nothing will harm you.