How serious is the sin of sexual immorality? The key to understand this is the single word known as covenant.
And to further expound on this word, we must apprehend the relationship between marriage, sex and our body.
Marriage is not a piece of paper as the moderns would have us believed. The foundation of marriage as God would have intended is covenantal. (Prov 2:17, Mal 2:14) What does that mean?
A marital covenant is a solemn bond between a man and a woman sealed by marital oath and consummated by sexual union. It is first and foremost an act of God. “What God has joined together, let no man put asunder”(Matt 19:6) God is the One who marry the first woman to the first man. From then on, it is to be a pattern to come.
Not only is marriage a covenant, it is also meant to image the great covenant between Christ and His Church transacted in the new covenant of Jeremiah 31:31.. This Paul revealed to us in Eph 5:32 and it is said to be a great mystery. By that, we understand that every marriage is a dim picture of the gospel, the relationship between Christ and His church. Depending on the marriage, every couple is either proclaiming it truthfully or falsely, nevertheless the proclamation is always made.
Husband, do you love your wife sacrificially and as your own body as Christ loves the church? Wife, do you submit to your husband and respect Him as the Head? God in His dispensation has ordained that how well we understand this New Covenant doctrine by how we treat our spouse! If a Christian man thinks that he has fulfill his husband duty by putting bread on the table and driving the kids to church on Sunday, he has yet to understand this doctrine.
As much as modern man may protest otherwise, every marriage is an act of God. But modern man continue to extinguish every creation of God by thinking that another piece of paper can easily replace the one the newly married have just signed. But the judgment of the scripture is that death and sexual immorality have the power to absolve this covenantal bond. (Matt 19 and Roman 7:2)
But why does sexual immorality have this absolving power? The key to understanding this is to understand the place of sex in God’s economy. Sex is not as many moderns would like to imagine, after a night of physical passion, the willing engaging parties departed in the same way they came with no ramification whatsoever. The bible declares that the one flesh union consummates our marital covenant. A covenant is not normally enacted unless the one flesh union has taken place together with the marriage oath. The two shall become one. And when a man has engaged in sexual intercourse with a woman, the two have become one body and a covenant has been enacted. (1 Cor 6: 16) This principle remains the same regardless if the man pays the woman or otherwise.
Looking from this light, when the married man join his body to another woman in extra marital infidelity, he is in fact covenanting with her and his original marital covenant will be broken. The marriage is therefore judged to have no covenanting bond. That is how powerful sexual immorality can be, even put asunder what God has joined together.
This also throws up some light regarding why sexual immorality is categorized under idolatry in Col 3:5. Idolatry is the sin of breaking the covenant of God by following after other idols. In similar way, sexual immorality has this capacity to break the marital covenant.
In view of all these, our unredeemed body does matter and this is in opposite to Gnostic doctrines. The fact is we are all going to dwell in bodies forever. We are going to live in flesh and bones forever!
Now this body is the temple of the Holy Spirit and it has been joined to the Lord in one spirit. Therefore the scripture exhorted us that the body is meant for the lord and the Lord for the body. We joined with the Lord’s Body, the church in baptism. That is why the Lord’s body, the church must give us the blessings before we can join to another body in holy matrimony.
There is a very clear connection that is made in Titus between sexual purity and the blessed hope: “teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age, looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ” (Tit. 2:12-13). The glory of the resurrection body is a great inducement to moral purity now.
The scripture says when we commit sexual sins, we sin against our bodies. Sexual sin is not the worst of the sins but it is certainly the most complicated. Some people understand this verse as contracting sexually transmitted diseases after a few rounds of reckless fling. It may very well includes that but considering what we have been talking about our bodies, sex and marriage, the impact of sexual sins is much broad based. This body which is given by God and indwelt by the Holy Ghost and ultimately to be joined to Jesus should not be thoughtlessly bonded to other illegitimate bodies covenantally through sexual immorality. We are really doing this body the utmost injury and risk falling short of the standards for the warning is clear and unmistakable (1 Cor 6:9)
What does this mean for us, husband? It means that we should keep our eyes on our wives, leave our heart at the altar of God and when we smell the slightest temptation, we should run a million miles away.