Matthew 17:11
"And Jesus answered and said unto them, Elias truly shall first come, and restore all things."
Cross References (ranked by relevance)
Acts 3:21
Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Malachi 4:6
And he shall turn the heart of the fathers to the children, and the heart of the children to their fathers, lest I come and smite the earth with a curse.