Watson's Biblical & Theological Dictionary
The phrase, "sons of Belial," signifies wicked, worthless men. It was given to the inhabitants of Gibeah, who abused the Levite's wife, Judges 19:22; and to Hophni and Phineas, the wicked and profane sons of Eli. 1 Samuel 2:12 . In later times the name Belial denoted the devil: "What concord hath Christ with Belial?"
2 Corinthians 6:15; for as the word literally imports "one who will do no one good," the positive sense of a doer of evil was applied to Satan, who is the author of evil, and, eminently, "the Evil One."
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Watson, Richard. Entry for 'Belial'. Richard Watson's Biblical & Theological Dictionary. https://www.studylight.org/dictionaries/eng/wtd/b/belial.html. 1831-2.