Mark 5:15-20 (NIV)
15 When they came to Jesus, they saw the man who had been possessed by the legion of demons, sitting there, dressed and in his right mind; and they were afraid. 16 Those who had seen it told the people what had happened to the demon-possessed man—and told about the pigs as well. 17 Then the people began to plead with Jesus to leave their region.
18 As Jesus was getting into the boat, the man who had been demon-possessed begged to go with him. 19 Jesus did not let him, but said, “Go home to your own people and tell them how much the Lord has done for you, and how he has had mercy on you.” 20 So the man went away and began to tell in the Decapolis how much Jesus had done for him. And all the people were amazed.