Luke 9:38-40

38Then a man from the crowd cried out, “Teacher, I beg you to look at my son – he is my only child!

39A spirit seizes him, and he suddenly screams; it throws him into convulsions and causes him to foam at the mouth. It hardly ever leaves him alone, torturing him severely.

40I begged your disciples to cast it out, but they could not do so.”