A demon or spirit of evil in Jewish and Christian tradition; also used to mean worthlessness, wickedness, or a wicked person.
From Hebrew 'beli'ya'al' meaning 'without worth' or 'worthless,' combining 'beli' (without/not) and 'ya'al' (worth/profit). The term appears in ancient biblical texts and Jewish religious literature.
Belial shows up throughout medieval literature and Milton's 'Paradise Lost' as one of the named demons—the name was so powerful that calling someone 'a son of Belial' was one of the ultimate insults in religious texts!
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