1 Corinthians 6:15

That marriage is not to be contracted with Gentiles. In Tobias: "Take a wife from the seed of thy parents, and take not a strange woman who is not of the tribe of thy parents."699 Also in Genesis, Abraham sends his servant to take from his seed Rebecca, for his son Isaac. Also in Esdras, it was not sufficient for God when the Jews were laid waste, unless they forsook their foreign wives, with the children also whom they had begotten of them. Also in the first Epistle of Paul to the Corinthians: "The woman is bound so long as her husband liveth; but if he die, she is freed to marry whom she will, only in the Lord. But she will be happier if she abide thus."700 And again: "Know ye not that your bodies are the members of Christ? Shall I take the members of Christ, and make them the members of an harlot? Far be it from me. Or know ye not that he who is joined together with an harlot is one body? for two shall be in one flesh. But he who is joined to the Lord is one spirit."701 Also in the second to the Corinthians: "Be not joined together with unbelievers. For what participation is there between righteousness and unrighteousness? or what communication hath light with darkness? "702 Also concerning Solomon in the third book of Kings: "And foreign wives turned away his heart after their gods."703

Christ gave this judgment when, being inquired of, He said that a wife must not be put away, save for the cause of adultery; such honour did He put upon chastity. Hence arose the decree: "Ye shall not suffer adulteresses to live."8 Hence the apostle says: "This is the will of God, that ye abstain from fornication."9 Hence also he says the same thing: "That the members of Christ must not be joined with the members of an harlot."10 Hence the man is delivered over unto Satan for the destruction of the flesh, who, treading under foot the law of chastity, practises the vices of the flesh. Hence with reason adulterers do not attain the kingdom of heaven. Hence it is that every sin is without the body, but that the adulterer alone sins against his own body. Hence other authoritative utterances of the instructor, all of which it is not necessary at this time to collect, especially among you, who for the most part know and do them; and you cannot find cause for complaint concerning these things, even though they are not described. For the adulterer has not an excuse, nor could he have, because he might take a wife.

Having passed on from the fornicator to the covetous person, he comes back to the former from the latter, no longer henceforth discoursing with him but with the others who had not committed fornication. And in the act of securing them lest they fall into the same sins, he assails him again. For he that has committed sin, though you direct your words to another, is stung even in that way; his conscience being thoroughly awakened and scourging him. Now the fear of punishment indeed was enough to keep them in chastity. But seeing that he does not wish by fear alone to set these matters right, he uses both threatenings and reasons. Now upon that other occasion, having stated the sin, and prescribed the punishment, and pointed out the harm which intercourse with the fornicator brought upon all, he left off, and passed to the subject of covetousness: and having threatened the covetous and all the rest whom he mentioned with expulsion from the kingdom, he so concluded his discourse. But here he takes in hand the work of admonition in a yet more terrific manner. For as he that only punishes a sin and does nothing to point out its most extreme lawlessness, produces no such great effect by his chastisement: so again, he who only abashes and fails to terrify by his mode of punishing, does not very keenly hit men of hardened minds. Wherefore Paul does both: here he abashes, saying, "Know ye not that we shall judge angels?" there again he terrifies, saying, "Know ye not that the covetous shall not inherit the kingdom of God?" And in regard to the fornicator, he again uses this order of discourse. […]

"Taking away the members of Christ, shall I make (them) members of an harlot? Know ye not, that whoever is agglutinated to an harlot is made one body? (for the two shall be (made) into one flesh): but whoever is agglutinated to the Lord is one spirit? Flee fornication." If revocable by pardon, in what sense am I to flee it, to turn adulterer anew? I shall gain nothing if I do flee it: I shall be "one body," to which by communion I shall be agglutinated.

Those, therefore, who are consecrated to God must never live mortally. "Nor," as Paul says, "is it meet to make the members of Christ the members of an harlot; nor must the temple of God be made the temple of base affections." Remember the four and twenty thousand that were rejected for fornication.

The cited passage shows what was stated, that is, in what manner the members of Christ become members of a harlot. Through intercourse, he says, a man becomes one with a harlot; therefore his members, which were members of Christ, become members of a harlot.

To approach Christ is through faith, or through the Sacrament of faith; and the faith of Christ is the same in past, present, and future: therefore the ground of influencing is posited in Christ with respect to all, past as well as present as well …

Then when he says, Do you not know, he presents a second reason, which is taken from the human body's affinity to Christ, namely: the fornicating man's members are the prostitute's members, but a man's members are Christ's members. Therefore, by fornicating, Christ's members become …

Again he returns to the previously proposed exhortation concerning fornication. Meanwhile, he arms his discourse with great terrors. He did not say: to unite with a harlot, but, what is more terrible, "to make them members of a harlot." Indeed, who would not be horrified, …

Know ye not that your bodies are the members, of Christ,.... The whole persons of God's elect were chosen in Christ, and given to him, and made one with him, their bodies as well as their souls; and both are redeemed by him, and, in union with him, are members of his body, of his flesh, and of his bones: shall I then take the members of Christ, and make them the members of an harlot? God forbid.

Note, We must take care that we do not use what belongs to Christ as if it were our own, and much less to his dishonour. Some understand this last passage, The Lord is for the body, thus: He is for its resurrection and glorification, according to what follows,

If the soul be united to Christ by faith, the whole man is become a member of his mystical body. The body is in union with Christ as well as the soul. How honourable is this to the Christian!

Know ye not ... - This is the third argument against licentiousness. It is, that we as Christians are united to Christ (compare the notes at Joh 15:1 ff); and that it is abominable to take the members of Christ and subject them to pollution and sin. Christ was pure - wholly pure. We are professedly united to him. We are bound therefore to be pure, as he was. Shall that which is a part, as it were, of the pure and holy Saviour, be prostituted to impure and unholy embraces? God forbid! - See the note at Rom 3:

For they cannot be at the same time "the members of an harlot," and "of Christ" [BENGEL]. It is a fact no less certain than mysterious, that moral and spiritual ruin is caused by such sins; which human wisdom (when untaught by revelation) held to be actions as blameless as eating and drinking [CONYBEARE and HOWSON].

Know ye not that your bodies are the members of Christ? - Because he has taken your nature upon him, and thus, as believers in him, ye are the members of Christ. Shall I then take, etc. - Shall we, who profess to be members of his body, of his flesh, and of his bones, connect ourselves with harlots, and thus dishonor and pollute the bodies which are members of Christ? God forbid! These passages admit of a more literal interpretation. This, if given at all, I must give in a strange language. Membra humana, ad generationem pertinentia, vocantur Membra Christi, quia mysterium conjunctionis Christi et Ecclesiae per conjunctionem maris et faeminae indigitatur, Eph 5:32. In Vet. Test. idem valebat de membro masculino, guippe quod circumcisione, tanquam signo faederis, honoratum est. Vide Schoettgen, Hor. Hebr.