Mark 9:14-18

When they came [back] to the [other nine] disciples, they saw a large crowd around them, and scribes questioning and arguing with them. [Matt 17:14-18; Luke 9:37-42] Immediately, when the entire crowd saw Jesus, they were startled and began running up to greet Him. He asked them, “What are you discussing with them?” One of the crowd replied to Him, “Teacher, I brought You my son, possessed with a spirit which makes him unable to speak; 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.”