What concord has Christ with Belial? As to the etymology of the word Belial, even the Hebrews themselves are not agreed [1] The meaning, however, is not doubtful. [2] For Moses takes a word or thought of Belial [3] to mean a wicked and base thought, [4] and in various instances [5] those who are wicked and abandoned to iniquity, are called men, or sons of Belial. (Deuteronomy 13:13; Judges 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.

Footnotes

1 - Beza, when mentioning the different views which have been taken of the etymology of the term Belial, remarks, that some derive it from vly yl beli jahal, (not profitable,) or from vly mvyl beli mohil, (worthless,) and that the term, viewed as having this derivation, is peculiarly appropriate to Satan, as being diametrically opposed to Christ, the Greatest and Best; while Jerome derives it from vly beli, (not) and yl hol, (a yoke,) as though you should say -- without a yoke, not subject to the yoke. Beza gives the preference to the former etymology, while he observes that the latter is also most appropriate to Satan as an apostate spirit. -- The original term Belial is rendered in various instances in the Septuagint paranomos, lawless. -- There is here a slight variation in reading. The Edit. Princ. and the Textus Receptus have Belial. The Erasmian, Stephanic, and other early editions have Beliar, which has been restored by Bengelius, Matthias, Griesbach, and Tittmann; and justly, for both external and internal evidence are in its favor; it being found in the majority of the MSS., in many early ecclesiastical writers, and Greek Fathers." -- Bloomfield. -- Ed

2 - "Et assez notoire;" -- "And is sufficiently well known."

3 - Thus in Deuteronomy 15:9, "Beware that there be not a thouqht in thy wicked heart." The expression made use of is phk-ychyh dvr m-lvvk vlyl "Lest there be in thine heart a thing of Belial." The same expression occurs in Psalm 41:9, where David's enemies represent him as suffering the punishment of detestable wickedness,dvr vlyl a thing of Belial." -- See Calvin on the Psalms, [46]vol. 2, p. 120. -- Ed.

4 - "Vne meschante et abominable parolle ou pensee;" -- "A wicked and abominable word or thought."

5 - "Souvent en l'Escriture;" -- "Frequently in Scripture."

And what concord - (συμφώνησις sumphōnēsis). Sympathy, unison. This word refers properly to the unison or harmony produced by musical instruments, where there is a chord. What accordance, what unison is there; what strings are there which being struck will produce a chord or harmony? The idea is, then, there is as much that is discordant between Christ and Belial as there is between instruments of music that produce only discordant and jarring sounds.
Hath Christ - What is there in common between Christ and Belial, implying that Christians are governed by the principles, and that they follow the example of Christ.
Belial - Βελίαλ Belial or Βελίαρ Beliar, as as it is found in some of the late editions. The form Beliar is Syriac. The Hebrew word בּליּצל beliya‛al means literally without profit; worthlessness; wickedness. It is here evidently applied to Satan. The Syriac translates it "Satan." The idea is, that the persons to whom Paul referred, the pagan, wicked, unbelieving world, were governed by the principles of Satan, and were "taken captive by him at his will" (2-Timothy 2:26 compare John 8:44), and that Christians should be separate from the wicked world, as Christ was separate from all the feelings, purposes, and plans of Satan. He had no participation in them; he formed no union with them; and so it should be with the followers of the one in relation to the followers of the other.
Or what part - (μερὶς meris). Portion, share, participation, fellowship. This word refers usually to a division of an estate; Luke 10:42; Acts 8:21 note; Colossians 1:12 note. There is no participation; nothing in common.
He that believeth - A Christian; a man the characteristic of whom it is that he believes on the Lord Jesus.
With an infidel - A man who does not believe - whether a pagan idolater, a profane man, a scoffer, a philosopher, a man of science, a moral man, or a son or daughter of gaiety. The idea is, that on the subject of religion there is no union; nothing in common; no participation. They are governed by different principles; have different feelings; are looking to different rewards; and are tending to a different destiny. The believer, therefore, should not select his partner in life and his chosen companions and friends from this class, but from those with whom he has sympathy, and with whom he has common feelings and hopes.

And what concord hath Christ with Belial? or what (k) part hath he that believeth with an infidel?
(k) What can there be between them?

And what concord hath Christ with Belial?.... The word "Belial" is an Hebrew word, and is only used in this place in the New Testament, but often in the Old; this word is differently read and pronounced, some copies read it "Beliar", and accordingly in the Ethiopic version it is "Belhor", and by Jerom read (i) Belvir"; but he observes, that it is more rightly called Belial": in some copies it is "Belias", and so Tertullian (k) read it; and Jerom (l) says, that most corruptly read it "Belias", for "Belial": some derive it from "Beli", and "Alah", and signifies "without ascent"; one in a very low condition, of low life, that never rises up, and comes to any thing; to which Kimchi's etymology of the word seems to agree, who says (m), that Belial is a wicked man, , "who does not succeed, and does not prosper": others say it signifies (n) one that is , "Beli Ol, without a yoke", without the yoke of the law; so Jarchi explains children of Belial, in Deuteronomy 13:13 without yoke, who break off the yoke of God; and so say (o) the Talmudists,
"children of Belial, are children that break off , "the yoke of heaven" (i.e. the law) from their necks;''
lawless persons, who are under no subjection to God or man: others (p) derive it from "Jaal", and "Beli", and so it signifies one that is unprofitable, does no good, and is good for nothing; and it is applied in Scripture to any wicked person, or thing; it is commonly rendered by the Chaldee paraphrast, a "wicked man"; and by Aquila and Suidas it is interpreted, "an apostate", and so it is rendered here in the Arabic version; sometimes the corruption of nature is called "Belial" by the Jews (q), than which nothing can be more contrary to Christ; it is also a name of the devil; by Hesychius, "Beliar" is interpreted "a dragon", by which name the devil is sometimes called; and here the Syriac version is, "what concord hath Christ with Satan?" most interpreters by Belial understand the devil, who has cast off the yoke of obedience to God, and is unprofitable, yea, noxious and hurtful to men; between whom and Christ there is no concord, but a perpetual enmity; and as there is no concord between Christ personal, and Belial the devil, so what can there be between Christ mystical the church, which goes by the name of Christ, 1-Corinthians 12:12 and wicked men, the sons of Belial; who have cast away the law of the Lord, are not subject to the law of God, nor can they be, and are become unprofitable to themselves, and others?
or what part hath he that believeth with an infidel? such have no part, and shall have no part or portion in one and the same thing; the believer's part and portion are God, Christ, and an eternal inheritance; the unbeliever's part and portion will be in the lake which burns with fire and brimstone; and therefore what part, society, or communion, can they have with one another?
(i) De Nominibus Hebraicis, fol. 106. K. (k) De Corona, c. 10. (l) Comment. in Ephes. iv. 27. (m) Sepher Shorashim, rad. (n) Hieronym Quaestasive Trad. Hebrews. in Lib. Reg. fol. 74. I. Tom. 3. & in Ephes. iv. 27. R. Abraham Seba in Tzeror Hammor, fol. 141. 4. & 142. 2. (o) T. Bab. Sanhedrin, fol. 111. 2. (p) Philip Aquinas, Schindler, Cocceius, &c. (q) Tzeror Hammor, fol. 148. 3. & 149. 2.

Belial--Hebrew, "worthlessness, unprofitableness, wickedness." As Satan is opposed to God, and Antichrist to Christ; Belial being here opposed to Christ, must denounce all manner of Antichristian uncleanness [BENGEL].
he that believeth with an infidel--Translate, "a believer with an unbeliever."

What concord hath Christ - Whom ye serve. With Belial - To whom they belong.