Mark 9:14-18 CSB
When they came to the disciples, they saw a large crowd around them and scribes disputing with them. When the whole crowd saw him, they were amazed and ran to greet him. He asked them, “What are you arguing with them about?”
Someone from the crowd answered him, “Teacher, I brought my son to you. He has a spirit that makes him unable to speak. Whenever it seizes him, it throws him down, and he foams at the mouth, grinds his teeth, and becomes rigid. I asked your disciples to drive it out, but they couldn’t.”
CSB: Christian Standard Bible