Baker's Evangelical Dictionary of Biblical Theology
In the Book of Revelation (9:1-11), when John sees his vision of the fifth trumpet blowing, a vast horde of demonic horsemen is seen arising from the newly opened abyss. They are sent forth to torment the unfortunate inhabitants of earth, but not to kill them. They have a ruler over them, called a king (basileia [ βασιλεία ]), the angel of the abyss, whose name is given in both Hebrew and Greek. In Hebrew it is Abaddon and in Greek Apollyon, both words meaning Destroyer or Destruction.
The word only occurs once in the New Testament (Revelation 9:11 ) and five times in the Old Testament (Job 26:6; 28:22; 31:12; Psalm 88:11; Proverbs 15:11 ). In Psalm 88:11 Destruction is parallel to the grave; in Job 26:6 and Proverbs 26:6 it is parallel to Sheol; in Job 28:22 it is parallel to Death. Job 31:12 says sin is a fire that burns to destruction. So in the Old Testament Abaddon means the place of utter ruin, death, desolation, or destruction.
The angel of the abyss is called Destruction or Destroyer because his task is to oversee the devastation of the inhabitants of the earth, although it is curious that his minions are allowed only to torture and not to kill. His identity is a matter of dispute. Some make him Satan himself, while others take him to be only one of Satan's many evil subordinates.
Walter A. Elwell
Baker's Evangelical Dictionary of Biblical Theology. Edited by Walter A. Elwell
Copyright © 1996 by Walter A. Elwell. Published by Baker Books, a division of Baker Book House Company, PO Box 6287, Grand Rapids, Michigan 49516-6287.
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Elwell, Walter A. Entry for 'Abaddon'. Evangelical Dictionary of Biblical Theology. https://www.studylight.org/dictionaries/eng/bed/a/abaddon.html. 1996.