LEVIATHAN : The Hebrew word (לִוְיָתָן liwyātān) appears six times in five verses in the Old Testament (Job 3:8; 41:1; Psalm 74:14, 104:26; Isaiah 27:1–twice). It is derived from the root “Iwy”which means to ‘“twist, coil,” and means “the sinuous one,” designating a kind of serpent. Job 26:13 mentions God’s mastery over the “fleeing serpent” (nāḥāš bārîaḥ), a phrase that is only found in Isaiah 27:1 to describe “Leviathan the twisting serpent” (liwyātān nāḥāš bāriaḥ). The Greek translation of the Old Testament (LXX) even calls Leviathan a dragon (δρακωον). So Leviathan is a symbol of the evil spirit that controls the world – the serpent that rules the world.
“In that day The LORD with His hard and great and strong sword will punish Leviathan the fleeing serpent, Leviathan, the twisting serpent, and He will slay the dragon that is in the sea.” (Isaiah 27:1)

“You divided the sea by Your strength; You smashed the heads of the dragons of the sea; You crushed the heads of Leviathan; You fed him to the creatures of the desert.” Psalm 74:13-14

“What is man that You are mindful of him, and the son of man that You visit him? For You have made him a little lower than the angels, and You have crowned him with glory and honor.You have made him to have dominion over the works of Your hands; You have put all things under his feet, all sheep and oxen — even the beasts of the field, the birds of the air, And the fish of the sea that pass through the paths of the seas.” Psalm 8:4

“Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.” Psalm 91:13

“When the waves of death compassed me, the floods of ungodly men made me afraid; when the cords of Sheol COILED AROUND me; the snares of death confronted me.
In my distress I called upon The LORD, and cried to my God: and he did hear my voice out of his temple, and my cry did enter into his ears. Then the earth shook and trembled; the foundations of heaven moved and shook, because he was wroth. There went up a smoke out of his nostrils, and fire out of his mouth devoured: coals were kindled by it.
He bowed the heavens also, and came down; and darkness was under His feet. And He rode upon a cherub, and did fly: and he was seen upon the wings of the wind. And He made darkness pavilions round about Him, dark waters, and thick clouds of the skies.
Through the brightness before Him were coals of fire kindled. The LORD thundered from heaven, and the most High uttered his voice. And He sent out arrows, and scattered them; lightning, and discomfited them. And the channels of the sea appeared, the foundations of the world were discovered, at the rebuking of The LORD, at the blast of the breath of his nostrils.
He sent from above, He took me; He drew me out of many waters; He delivered me from my strong enemy, and from them that hated me: for they were too strong for me. They prevented me in the day of my calamity: but The LORD was my stay.” 2 Samuel 22:5-19