Biblical Examples of Believers in Non-Believer Relationships
Scripture records several instances where believers maintained relationships with unbelievers, though the nature and boundaries of these relationships varied significantly. The clearest biblical examples appear in marriage contexts, where the apostle Paul addresses mixed-faith unions that arose after one spouse converted to Christianity.
Marriage to Unbelievers
Paul's instructions in 1 Corinthians 7 presume the existence of marriages where one partner believes and the other does not. He explicitly commands that "if any brother has a wife who is an unbeliever, and she consents to live with him, he must not divorce her" [4]. The same principle applies to believing wives with unbelieving husbands. Paul grounds this instruction in the concept that "the unbelieving husband is sanctified by the wife" [9]—not in the sense of internal conversion, but in terms of the covenant relationship's legitimacy and the children's standing within the believing community.
The commentators note historical precedents: Ruth the Moabitess converted through her relationship with her husband's family, and Joseph and Moses likely influenced their foreign wives toward faith [8]. These examples suggest that maintaining such relationships could serve evangelistic purposes, as Paul indicates when he asks, "What knowest thou but that by staying with thy unbelieving partner thou mayest save him or her?" [8].
However, Paul establishes clear limits. If the unbelieving spouse "wishes for separation" or "separate themselves from the believing party on account of religion," the believer is "not under bondage" and may let them depart [4, 5]. The principle prioritizes peace over forced cohabitation when the unbeliever demands renunciation of faith [6].
The Prohibition Against New Unions
While Scripture acknowledges existing mixed marriages, it prohibits believers from entering new ones. Paul's warning against being "unequally yoked together with unbelievers" [7] draws on Levitical prohibitions against yoking different animals and Deuteronomic laws forbidding marriage with pagans [3]. The rhetorical question "What harmony is there between Christ and Belial?" [1, 2] underscores the fundamental incompatibility in spiritual orientation, though commentators clarify this does not forbid all "civil society and converse with unbelievers," which would require believers to "go out of the world" [7].
Sources
- II Corinthians “II Corinthians 6:15 (BSB) — What harmony is there between Christ and Belial? Or what does a believer have in common with an unbeliever?”
- 2 Corinthians “2 Corinthians 6:15 (NASB) — Or what harmony has Christ with Belial, or what has a believer in common with an unbeliever?”
- 2 Corinthians (Presbyterian) “Jamieson, Fausset & Brown on 2 Corinthians 6:14: Be not--Greek, "Become not." unequally yoked--"yoked with one alien in spirit." The image is from the symbolical precept of the law (Lev 19:19), "Thou shalt not let thy cattle gender with a diverse kind"; or the precept (Deu 22:10), "Thou shalt not plough with an ox and an ass together." Compare Deu 7:3, forbidding marriages with the heathen; also Co1 7:39. The believer and unbeliever are utterly heterogeneous. Too close intercourse with unbelievers in other relations also is included (Co2 6:16; Co1 8:10; Co1 10:14). fellowship--literally, "”
- 1 Corinthians (Presbyterian) “Jamieson, Fausset & Brown on 1 Corinthians 7:15: if . . . depart--that is, wishes for separation. Translate, "separateth himself": offended with her Christianity, and refusing to live with her unless she renounce it. brother or a sister is not under bondage--is not bound to renounce the faith for the sake of retaining her unbelieving husband [HAMMOND]. So Deu 13:6; Mat 10:35-37; Luk 14:26. The believer does not lie under the same obligation in the case of a union with an unbeliever, as in the case of one with a believer. In the former case he is not bound not to separate, if the unbeliever s”
- 1 Corinthians (Baptist/Reformed) “John Gill on 1 Corinthians 7:15: But if the unbelieving depart,.... If the unbelieving party, man or woman, separate themselves from the believing party on account of religion, and in hatred to it, and will not live with the believer unless Christ is denied, his Gospel abjured, and his ordinances and worship relinquished: let him depart; he or she, though not without making use of all proper means to retain them; but if, after all, they will go, unless such things are complied with as are unreasonable and sinful, they are not to be held, but let go; and the deserted person may sit down conte”
- 1 Corinthians (Protestant academic) “Tyndale House on 1 Corinthians 7:15: 7:15 If the unbeliever breaks up the marriage, the believing husband or wife is free to let them go. • has called you: God’s desire is that his people live in peace, rather than in the intolerable conflict of a mixed marriage no longer desired by the non-Christian spouse.”
- 2 Corinthians (Baptist/Reformed) “John Gill on 2 Corinthians 6:13: Be ye not unequally yoked together with unbelievers,.... This seems to be an allusion to the law in Deu 22:10 and to be a mystical explanation of it; and is to be understood not as forbidding civil society and converse with unbelievers; for this is impracticable, then must believers needs go out of the world; this the many natural and civil relations subsisting among men make absolutely necessary; and in many cases is both lawful and laudable, especially when there is any opportunity or likelihood of doing them any service in a spiritual way: not is it to be un”
- 1 Corinthians (Presbyterian) “Jamieson, Fausset & Brown on 1 Corinthians 7:16: What knowest thou but that by staying with thy unbelieving partner thou mayest save him or her? Enforcing the precept to stay with the unbelieving consort (Co1 7:12-14). So Ruth the Moabitess became a convert to her husband's faith: and Joseph and Moses probably gained over their wives. So conversely the unbelieving husband may be won by the believing wife (Pe1 3:1) [CALVIN]. Or else (Co1 7:15), if thy unbelieving consort wishes to depart, let him go, so that thou mayest live "in peace": for thou canst not be sure of converting him, so as to mak”
- 1 Corinthians (Baptist/Reformed) “John Gill on 1 Corinthians 7:14: For the unbelieving husband is sanctified by the wife,.... That is, "by the believing wife"; as the Vulgate Latin and Syriac versions read, and so it is read in some copies; and likewise in the next clause the same is read, by the believing husband; this is a reason given by the apostle why they should live together. This cannot be understood of internal sanctification, which is never the case; an unbeliever cannot be sanctified by a believer in this sense, for such a sanctification is only by the Spirit of God; nor external sanctification, or an outward refo”