Leviathan

The Leviathan is mentioned six times in the Hebrew Bible.

 Job 41 being dedicated to describing him in detail:

¹ Can you pull in the leviathan with a fishhook or tie down his tongue with a rope?

² Can you put a cord through his nose or pierce his jaw with a hook?

³ Will he keep begging you for mercy? Will he speak to you with gentle words?

⁴ Will he make an agreement with you for you to take him as your slave for life?

⁵ Can you make a pet of him like a bird or put him on a leash for your girls?

⁶ Will traders barter for him? Will they divide him up among the merchants?

⁷ Can you fill his hide with harpoons or his head with fishing spears?

⁸ If you lay a hand on him, you will remember the struggle and never do it again!

⁹ Any hope of subduing him is false; the mere sight of him is overpowering.

¹⁰ No-one is fierce enough to rouse him. Who then is able to stand against me?

¹¹ Who has a claim against me that I must pay? Everything under heaven belongs to me.

¹² I will not fail to speak of his limbs, his strength and his graceful form.

¹³ Who can strip off his outer coat? Who would approach him with a bridle?

¹⁴ Who dares open the doors of his mouth, ringed about with his fearsome teeth?

¹⁵ His back has rows of shields tightly sealed together;

¹⁶ each is so close to the next that no air can pass between.

¹⁷ They are joined fast to one another; they cling together and cannot be parted.

¹⁸ His snorting throws out flashes of light; his eyes are like the rays of dawn.

¹⁹ Firebrands stream from his mouth; sparks of fire shoot out.

²⁰ Smoke pours from his nostrils as from a boiling pot over a fire of reeds.

²¹ His breath sets coals ablaze, and flames dart from his mouth.

²² Strength resides in his neck; dismay goes before him.

²³ The folds of his flesh are tightly joined; they are firm and immovable.

²⁴ His chest is hard as rock, hard as a lower millstone.

²⁵ When he rises up, the mighty are terrified; they retreat before his thrashing.

²⁶ The sword that reaches him has no effect, nor does the spear or the dart or the javelin.

²⁷ Iron he treats like straw and bronze like rotten wood.

²⁸ Arrows do not make him flee, slingstones are like chaff to him.

²⁹ A club seems to him but a piece of straw, he laughs at the rattling of the lance.

³⁰ His undersides are jagged potsherds, leaving a trail in the mud like a threshing-sledge.

³¹ He makes the depths churn like a boiling cauldron and stirs up the sea like a pot of ointment.

³² Behind him he leaves a glistening wake; one would think the deep had white hair.

³³ Nothing on earth is his equal— a creature without fear.

³⁴ He looks down on all that are haughty; he is king over all that are proud.

In Psalm 74 Yahweh(God) is said to "break the heads of Leviathan in pieces" before giving his flesh to the people of the wilderness; in Psalm 104 God is praised for having made all things, including Leviathan; and in Isaiah 27:1 he is called the "wriggling serpent" who will be killed at the end of time