Mark 9:13
"But I say unto you, That Elias is indeed come, and they have done unto him whatsoever they listed, as it is written of him."
Cross References (ranked by relevance)
Matthew 11:14
And if ye will receive it, this is Elias, which was for to come.
Luke 1:17
And he shall go before him in the spirit and power of Elias, to turn the hearts of the fathers to the children, and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord.
Acts 7:52
Which of the prophets have not your fathers persecuted? and they have slain them which shewed before of the coming of the Just One; of whom ye have been now the betrayers and murderers: