Leviathan

He makes the deep to boil like a pot,
he makes the sea like a pot of ointment,
ointment in a mixing bowl.
He leaves a shining trail behind him,
and in his wake the great river is like white hair.
Upon the earth there is not his like.

Job 41:31-33 Revised English Bible

It appears many Bible scholars consider this to be about some kind of giant crocodile,
but I always visualize a whale or "great fish"