Mark 5:18-20

18And when He got into the boat, he who had been demon-possessed begged Him that he might be with Him.

19However, Jesus did not permit him, but said to him, “Go home to your friends, and tell them what great things the Lord has done for you, and how He has had compassion on you.”

20And he departed and began to proclaim in Decapolis all that Jesus had done for him; and all marveled.