2 Corinthians 6:15

15.What concord has Christ with Belial? As to the etymology of the word Belial, even the Hebrews themselves are not agreed (612) The meaning, however, is not doubtful. (613) For Moses takes a word or thought of Belial (614) to mean a wicked and base thought, (615) and in various instances (616) those who are wicked and abandoned to iniquity, are called men, or sons of Belial. (Deuteronomy 13:13; Jude 19:22; 1 Samuel 2:12.) Hence it is, that Paul has employed the word here to mean the devil, the head of all wicked persons. For from what holds good as to the two heads, he comes down without delay to the members: “As there is an irreconcilable variance between Christ and Satan, so we also must keep aloof from partnership with the wicked.” When, however, Paul says that a Christian has no participation with an unbeliever, he does not mean as to food, clothing, estates, the sun, the air, as I have mentioned above, but as to those things that are peculiar to unbelievers, from which the Lord has separated us.