Mark 9:17-18

17A man in the crowd answered. He said to Jesus, ‘Teacher, I brought my son to you. He is not able to speak because he has a bad spirit.

18When the bad spirit takes hold of him, it throws him to the ground. Water comes out of his mouth and he bites his teeth together. Then his body stops moving. I asked your disciples to send the spirit out of him. But they were not able to do it.’