Luke 9:39

9:39 A 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.

Luke 9:42

9:42 As the boy was approaching, the demon threw him to the ground and shook him with convulsions. But Jesus rebuked the unclean spirit, healed the boy, and gave him back to his father.