Mark 9:15

11 And they asked Jesus, “Why do the scribes say that Elijah must come first?”

12 He replied, “Elijah does indeed come first, and he restores all things. Why then is it written that the Son of Man must suffer many things and be rejected?

13 But I tell you that Elijah has indeed come, and they have done to him whatever they wished, just as it is written about him.”

14 When they returned to the other disciples, they saw a large crowd around them, and scribes arguing with them.

15 As soon as all the people saw Jesus, they were filled with awe and ran to greet Him.

16 “What are you disputing with them?” He asked.

17 Someone in the crowd replied, “Teacher, I brought You my son, who has a spirit that makes him mute.

18 Whenever it seizes him, it throws him to the ground. He foams at the mouth, gnashes his teeth, and becomes rigid. I asked Your disciples to drive it out, but they were unable.”

19 “O unbelieving generation!” Jesus replied. “How long must I remain with you? How long must I put up with you? Bring the boy to Me.”

Read all of Mark 9