Leviathan is a creature with the form of a sea monster from Jewish belief, referenced in the Hebrew Bible in the Book of Job, Psalms, the Book of Isaiah, and the Book of Amos. Leviathan figures in the Hebrew Bible as a metaphor for a powerful enemy, notably Babylon (Isaiah 27:1), and some 19th century scholars have pragmatically interpreted it as referring to large aquatic creatures, such as the crocodile. The word later came to be used as a term for "great whale" as well as of sea monsters in general.