Mark 5:15-20

They came to Jesus and saw the man who had been demon-possessed sitting down, clothed and in his right mind, the man who had [previously] had the “legion” [of demons]; and they were frightened. Those who had seen it described [in detail] to the people what had happened to the demon-possessed man, and [told them all] about the pigs. So the people began to beg with Jesus to leave their region. As He was stepping into the boat, the [Gentile] man who had been demon-possessed was begging with Him [asking] that he might go with Him [as a disciple]. Jesus did not let him [come], but [instead] He said to him, “Go home to your family and tell them all the great things that the Lord has done for you, and how He has had mercy on you.” So he [obeyed and] went away and began to publicly proclaim in Decapolis [the region of the ten Hellenistic cities] all the great things that Jesus had done for him; and all the people were astonished.