ISA 27:1

1 In Yom Hahu Hashem with His cherev hakashah v'hagedolah v'hachazakah [(terrible and great and strong sword)] shall punish Leviathan the Nachash bari'ach [(fleeing serpent)], even Leviathan that Nachash akallaton [(crooked serpent)]; and He shall slay the Tanin [(serpent, devouring sea monster)] that is in the sea.