Elijah was a prophet

Prophet

In religion, a prophet, from the Greek word προφήτης profitis meaning "foreteller", is an individual who is claimed to have been contacted by the supernatural or the divine, and serves as an intermediary with humanity, delivering this newfound knowledge from the supernatural entity to other people...

 in the Kingdom of Samaria during the reign of Ahab

Ahab

Ahab or Ach'av or Achab in Douay-Rheims was king of Israel and the son and successor of Omri according to the Hebrew Bible. His wife was Jezebel....

 (9th century BCE), according to the Books of Kings

Books of Kings

The Book of Kings presents a narrative history of ancient Israel and Judah from the death of David to the release of his successor Jehoiachin from imprisonment in Babylon, a period of some 400 years...

.

According to the Books of Kings, Elijah defended the worship of Yahweh

Yahweh

Yahweh is the name of God in the Bible, the God of Abraham, Isaac, Jacob, Jews and Christians.The word Yahweh is a modern scholarly convention for the Hebrew , transcribed into Roman letters as YHWH and known as the Tetragrammaton, for which the original pronunciation is unknown...

 over that of the more popular Baal

Baal

Baʿal is a Northwest Semitic title and honorific meaning "master" or "lord" that is used for various gods who were patrons of cities in the Levant and Asia Minor, cognate to Akkadian Bēlu...

, he raised the dead

Resurrection

Resurrection refers to the literal coming back to life of the biologically dead. It is used both with respect to particular individuals or the belief in a General Resurrection of the dead at the end of the world. The General Resurrection is featured prominently in Jewish, Christian, and Muslim...

, brought fire down from the sky

Sky

The sky is the part of the atmosphere or outer space visible from the surface of any astronomical object. It is difficult to define precisely for several reasons. During daylight, the sky of Earth has the appearance of a pale blue surface because the air scatters the sunlight. The sky is sometimes...

, and ascended into heaven in a whirlwind (either accompanied by a chariot and horses of flame or riding in it). In the Book of Malachi

Book of Malachi

Malachi is a book of the Hebrew Bible, the last of the twelve minor prophets and the final book of the Neviim...

, Elijah's return is prophesied "before the coming of the great and terrible day of the Lord," making him a harbinger of the Messiah

Messiah

A messiah is a redeemer figure expected or foretold in one form or another by a religion. Slightly more widely, a messiah is any redeemer figure. Messianic beliefs or theories generally relate to eschatological improvement of the state of humanity or the world, in other words the World to...

 and the eschaton

Eschatology

Eschatology is a part of theology, philosophy, and futurology concerned with what are believed to be the final events in history, or the ultimate destiny of humanity, commonly referred to as the end of the world or the World to Come...

 in various faiths that revere the Hebrew Bible.