2 Corinthians 6:14-15
14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?
I. The caution or exhortation itself, not to mingle with unbelievers, not to be unequally yoked with them, 2 Cor 6:14. Either,
1. In stated relations. It is wrong for good people to join in affinity with the wicked and profane; these will draw different ways, and that will be galling and grievous. Those relations that are our choice must be chosen by rule; and it is good for those who are themselves the children of God to join with those who are so likewise; for there is more danger that the bad will damage the good than hope that the good will benefit the bad.
2. In common conversation. We should not yoke ourselves in friendship and acquaintance with wicked men and unbelievers. Though we cannot wholly avoid seeing, and hearing, and being with such, yet we should never choose them for our bosom-friends.
3. Much less should we join in religious communion with them; we must not join with them in their idolatrous services, nor concur with them in their false worship, nor any abominations; we must not confound together the table of the Lord and the table of devils, the house of God and the house of Rimmon. The apostle gives several reasons against this corrupt mixture.
(1.) It is a very great absurdity, 2 Cor. 6:14-15. It is an unequal yoking of things together that will not agree together; as bad as for the Jews to have ploughed with an ox and an ass or to have sown divers sorts of grain intermixed. What an absurdity it is to think of joining righteousness and unrighteousness, or mingling light and darkness, Fire and Water, together! Believers are, and should be, righteous; but unbelievers are unrighteousness. Believers are made light in the Lord, but unbelievers are in darkness; and what comfortable communion can these have together? Christ and Belial are contrary to one another; they have opposite interests and designs, so that it is impossible there should be any concord or agreement between them. It is absurd, therefore, to think of enlisting under both; and, if the believer has part with an infidel, he does what in him lies to bring Christ and Belial together.
— Daniel May0 (1672 - 1733), from Matthew Henry’s Commentary on the Whole Bible