11 Then they asked Him, "Why do the scribes say that Elijah has to come first?"
Mark 9:11 Cross References - Williams
Matthew 11:14
14 and if you are willing to accept it, John himself is the Elijah who was to come.
Matthew 17:10-11
Mark 9:4
4 And Elijah appeared to them, accompanied by Moses, and they were talking with Jesus.