https://jewishencyclopedia.com/articles/13363-sea-monster
Psalm 104:26
Ships sail over the ocean, and playing there is Leviathan, the great sea creature you made.
Isa 27:1
Contemporary English Version
On that day, Leviathan, the sea monster, will squirm and try to escape, but the LORD will kill him with a cruel, sharp sword.
Good News Translation
On that day the LORD will use his powerful and deadly sword to punish Leviathan, that wriggling, twisting dragon, and to kill the monster that lives in the sea.
The part some translation mistranslated as snake is really about how the creature tries to escape.
Psalm 104:26
Ships sail over the ocean, and playing there is Leviathan, the great sea creature you made.
Isa 27:1
Contemporary English Version
On that day, Leviathan, the sea monster, will squirm and try to escape, but the LORD will kill him with a cruel, sharp sword.
Good News Translation
On that day the LORD will use his powerful and deadly sword to punish Leviathan, that wriggling, twisting dragon, and to kill the monster that lives in the sea.
The part some translation mistranslated as snake is really about how the creature tries to escape.