The Leviathan Serpent in the Bible
"Leviathan" denotes an animal wreathed, gathering itself in coils: hence a serpent, or some great reptile. The description in Job xli. is evidently that of a mighty crocodile, though in Psalm civ. leviathan is said to play in "the great and wide sea," which has raised a difficulty as to its identification in the minds of some commentators. In the present passage it is supposed to mean one of the stellar dragons, and hence the mythical dragon of eclipse. Job desired that the day of his birth should have been cursed by the magicians, so that it had been a day of complete and entire eclipse, not even the stars that preceded its dawn being allowed to shine.
The astronomical use of the word leviathan here renders it possible that there may be in Isa. xxvii. an allusion—quite secondary and indirect however—to the chief stellar dragons.
"In that day the Lord with His sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and He shall slay the dragon that is in the sea."
The marginal reading gives us instead of "piercing," "crossing like a bar"; a most descriptive epithet for the long-drawn-out constellation of Hydra, the Water-snake, which stretched itself for one hundred and five degrees along the primitive equator, and "crossed" the meridian ]"like a bar" for seven hours out of every twenty-four. "The crooked serpent" would denote the dragon coiled around the poles, whilst "the dragon which is in the sea" would naturally refer to Cetus, the Sea-monster. The prophecy would mean then, that "in that day" the Lord will destroy all the powers of evil which have, as it were, laid hold of the chief places, even in the heavens.
In one passage "the crooked serpent," here used as a synonym of leviathan, distinctly points to the dragon of the constellations. In Job's last answer to Bildad the Shuhite, he says—
"He divideth the sea with His power,And by His understanding He smiteth through the proud. (R.V. Rahab.)By His spirit He hath garnished the heavens;His hand hath formed the crooked serpent."