Mark 9:17-18 ▼

17 One of the crowd replied to Him, “Teacher, I brought You my son, possessed with a spirit which makes him unable to speak;

18 and whenever it seizes him [intending to do harm], it throws him down, and he foams [at the mouth], and grinds his teeth and becomes stiff. I told Your disciples to drive it out, and they could not do it.”