Elijah
In Malachi

While the final mention of Elijah in the Hebrew Bible is in the Book of Chronicles, the Christian Bible ’s reordering places the Book of Malachi (which prophesies a messiah) as the final book of the Old Testament, before the New Testament gospels. Thus, Elijah's final Old Testament appearance is in the Book of Malachi, where it is written, "Behold, I will send you Elijah the prophet before the great and awesome day of the Lord comes. And he will turn the hearts of fathers to their children and the hearts of children to their fathers, lest I come and strike the land with a decree of utter destruction."
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