…this is scriptural. I Corinthians 5 gives a complete synopsis of this teaching. Be advised, the scenario in this situation was incest, however it refers to ALL fornication, i.e. sexual unions outside of holy matrimony:
I Corinthians, Chapter 5
The incestuous person among them
The Christian church must be purged of the contamination of sinners, and separated from pagan influences
9 I wrote unto you in my epistle to have no company with fornicators; 10 not at all meaning with the fornicators of this world, or with the covetous and extortioners, or with idolaters; for then must ye needs go out of the world: 11 but as it is, I wrote unto you not to keep company, if any man that is named a brother be a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner; with such a one no, not to eat. 12 For what have I to do with judging them that are without? Do not ye judge them that are within? 13 But them that are without God judgeth. Put away the wicked man from among yourselves.
1 Cor 5:1-13 (ASV)
Note the very last scripture, I Corinthians 5:13 “But them that are without God judgeth. Put away the wicked man from among yourselves.” Today, brazen fornicators are NOT purged. They live their ungodly lifestyles while attending church. Preachers, teachers and church leaders today often do not even confront or challenge their sin. They look the other way instead of being faithful to God. The problem is that these situations never resolve themselves. This is a church one would want to leave if they do not require repentance from the one(s) involved.
It would behoove the church and professing Christians to read the following passage from Ephesians 5 very carefully:
to flee fornication
21 subjecting yourselves one to another in the fear of Christ. 22 Wives, be in subjection unto your own husbands, as unto the Lord. 23 For the husband is the head of the wife, and Christ also is the head of the church, being himself the saviour of the body. 24 But as the church is subject to Christ, so let the wives also be to their husbands in everything. 25 Husbands, love your wives, even as Christ also loved the church, and gave himself up for it; 26 that he might sanctify it, having cleansed it by the washing of water with the word, 27 that he might present the church to himself a glorious church, not having spot or wrinkle or any such thing; but that it should be holy and without blemish. 28 Even so ought husbands also to love their own wives as their own bodies. He that loveth his own wife loveth himself: 29 for no man ever hated his own flesh; but nourisheth and cherisheth it, even as Christ also the church; 30 because we are members of his body. 31 For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall become one flesh. 32 This mystery is great: but I speak in regard of Christ and of the church. 33 Nevertheless do ye also severally love each one his own wife even as himself; and let the wife see that she fear her husband.
Eph 5:3-33 (ASV)
…here is another scripture passage that is usually totally ignored by the church of today, thus rendering the church powerless-
“Them that sin reprove in the sight of all, that the rest also may be in fear.”
1 Tim 5:20 (ASV)
Here is a question to think about: Who is worse in the sight of the Lord? Those who engage in sexual sin without repentance and remorse, or the church that is aware of it and prefers to not address it?
When we ignore sin in our lives and refuse to repent, whether a church or an individual, we will suffer separation from the Lord God and punishment.
18 If I regard iniquity in my heart, the Lord will not hear me: