Mark 5:18-20

As Jesus stepped into the boat, the man who had been demon-possessed begged him, “Let me stay with you.” But Jesus would not allow it. Instead, he told the man, “Go home to your family, and tell them how much the Lord has done for you and how merciful he has been to you.” So the man left. He began to tell how much Jesus had done for him in the Ten Cities. Everyone was amazed.