In the Catholic Bible, Psalm 91 introduces the reader to Elyon, and states that the one who lives in the secret place of Elyon will find protection under the shelter of Shaddai. Both the terms Elyon and Shaddai are transliterations of Hebrew words meaning God Most High and Almighty, respectively.
The Psalm says that Yahweh will rescue the man of faith from the snare of the fowler or birdcatcher. The entire Psalm expresses how Elyon or Shaddai will rescue His servant from the various machinations of the devil and his cohorts. The Psalm also says that the faithful need not fear "the plague that stalks in the darkness, the scourge that wreaks havoc at high noon." At a later point, the Psalm says that "no plague [will] come near your tent." These appear to be references to the plagues that Yahweh sent upon Egypt at the time leading to the Exodus. There also may be a Messianic prophecy in the words "You will walk upon wild beast and adder, you will trample young lions and snakes." The very first prophecy in Genesis states, in cryptic language, that the Savior would one day trample under foot Satan and all his works. Satan is often symbolized as a snake throughout the Bible.