They shall no more offer their sacrifices to demon s, after whom they have played the harlot. This shall be a statute forever for them throughout their generations. When evening had come, they brought to Him many who were demon-possessed. And He cast out the spirits with a word, and healed all who were sick , Demons can make a possessed human very fierce. When He had come to the other side, to the country of the Gergesenes, there met Him two demon-possessed men , coming out of the tombs, exceedingly fierce , so that no one could pass that way.
Demons can make the person that they possess sick.
As they went out, behold, they brought to Him a man, mute and demon-possessed . And when the demon was cast out , the mute spoke . Then they came to Jesus, and saw the one who had been demon-possessed and had the legion, sitting and clothed and in his right mind . And they were afraid. One or more demons can be in a person.