(Hebrew). The worthless or lawléss one, i.e. the devil. Milton, in his pandemonium, makes him a very high and distinguished prince of darkness. (Paradise Lost.)
“What concord hath Christ with Belial?” —2 Cor. vi. 15.
Belial came last- than whom a spirit more lewd Fell not from heaven, or more gross to love Vice for itself.
Milton: Paradise Lost, book i. 490-2.
“Now the sons of Eli were sons of Belial.” —1 Sam. ii. 12.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Belial from Infoplease: