Mark 9:11-13

And they asked him, saying, How is it that the scribes say that Elijah must first come? And he said unto them, Elijah indeed cometh first, and restoreth all things: and how is it written of the Son of man, that he should suffer many things and be set at nought? But I say unto you, that Elijah is come, and they have also done unto him whatsoever they would, even as it is written of him.