Luke 9:37-40

The next day, when they came down from the mountain, a large crowd met Jesus. A man in the crowd shouted to him, “Teacher, please come and look at my son, because he is my only child. An evil spirit seizes my son, and suddenly he screams. It causes him to lose control of himself and foam at the mouth. The evil spirit keeps on hurting him and almost never leaves him. I begged your followers to force the evil spirit out, but they could not do it.”