Luke 9:38

36And when the voice was past, Jesus was found alone. And they kept it close, and told no man in those days any of those things which they had seen.

37And it came to pass, that on the next day, when they were come down from the hill, much people met him.

38And, behold, a man of the company cried out, saying, Master, I beseech thee, look upon my son: for he is mine only child.

39And, lo, a spirit taketh him, and he suddenly crieth out; and it teareth him that he foameth again, and bruising him hardly departeth from him.

40And I besought thy disciples to cast him out; and they could not.