Mark 5:18-20

As he was getting into the boat, the man who had been demon-possessed begged him earnestly that he might remain with him. Jesus did not let him but told him, “Go home to your own people, and report to them how much the Lord has done for you and how he has had mercy on you.” So he went out and began to proclaim in the Decapolis how much Jesus had done for him, and they were all amazed.