Mark 9:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ He asked them, ‘What are you arguing about with them?’ ¹⁷ Someone from the crowd answered him, ‘Teacher, I brought you my son; he has a spirit that makes him unable to speak; ¹⁸ and whenever it seizes him, it dashes him down; and he foams and grinds his teeth and becomes rigid; and I asked your disciples to cast it out, but they could not do so.’