Malachi 4:5

5Look, I will send you Elijah
I will send you Elijah the prophet. In light of the ascension of Elijah to heaven without dying (2 Kgs 2:11), Judaism has always awaited his return as an aspect of the messianic age (see, e.g., John 1:19–28). Jesus identified John the Baptist as Elijah, because he came in the “spirit and power” of his prototype Elijah (Matt 11:14; 17:1–13; Mark 9:2–13; Luke 9:28–36).
the prophet before the great and terrible day of the Lord arrives.
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