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Isaiah 27:1

In that day the LORD with his hard and great and strong sword shall punish leviathan the fleeing serpent, even leviathan that twisted serpent; and he shall slay the monster that is in the sea.
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Gregory The Dialogist

AD 604
For “Leviathan” is interpreted to be “their addition.” Whose “addition,” then, but the “addition” of people? And it is properly styled “their addition,” for since by his evil suggestion he brought into the world the first sin, he never ceases to add to it day by day by prompting to worse things. Or indeed it is in reproach that he is called Leviathan, that is, styled “the addition of men.” For he found them immortal in Paradise, but by promising the divine nature to immortal beings, he as it were pledged himself to add somewhat to them beyond what they were. But while with flattering lips he declared that he would give what they did not have, he robbed them cunningly even of what they had. And hence the prophet describes this same Leviathan in these words, “Leviathan, the serpent: even Leviathan that crooked serpent.” For this Leviathan crept near to people with tortuous windings through the false promise of what he would give them; for while he falsely promised things impossible, he really stole away even those which were possible.
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Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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