Leviathan is a massive sea serpent that appears throughout the Hebrew Bible and related texts. Originally there was a female leviathan, but God killed it out of fear that they’d multiply and destroy the world. He saved the flesh of the for the banquet at tLeviathan is a massive sea serpent that appears throughout the Hebrew Bible and related texts. Originally there was a female leviathan, but God killed it out of fear that they’d multiply and destroy the world. He saved the flesh of the beast for the banquet at the advent of the Messiah.he advent of the Messiah. In Binsfeld’s classification of , Leviathan is considered the of envy. Image: Gustave Doré, 1865