Those who have believed the gospel and have been baptised into Christ become members of a particular ‘church’ (a body of believers not a building). They all have a part to play in the edification of the body.
1 Corinthians 12:12 For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. 13 For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.14 For the body is not one member, but many. 15 If the foot shall say, Because I am not the hand, I am not of the body; is it therefore not of the body? 16 And if the ear shall say, Because I am not the eye, I am not of the body; is it therefore not of the body? 17 If the whole body were an eye, where were the hearing? If the whole were hearing, where were the smelling? 18 But now hath God set the members every one of them in the body, as it hath pleased him. 19 And if they were all one member, where were the body? 20 But now are they many members, yet but one body. 21 And the eye cannot say unto the hand, I have no need of thee: nor again the head to the feet, I have no need of you. 22 Nay, much more those members of the body, which seem to be more feeble, are necessary: 23 And those members of the body, which we think to be less honourable, upon these we bestow more abundant honour; and our uncomely parts have more abundant comeliness. 24 For our comely parts have no need: but God hath tempered the body together, having given more abundant honour to that part which lacked: 25 That there should be no schism in the body; but that the members should have the same care one for another. 26 And whether one member suffer, all the members suffer with it; or one member be honoured, all the members rejoice with it.
With this in mind, if a member subsequently behaves in a way which is not according to the commandments of Christ, and refuses to be admonished, then the body of believers that he/she belongs to must refuse to fellowship them.
Christ lays out the process which must be applied.
Matthew 18:15 Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. 16 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. 17 And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.
Paul gives the following instructions.
Romans 16:17 Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.
1 Corinthians 5:9 I wrote unto you in an epistle not to company with fornicators: 10 Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world. 11 But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat. 12 For what have I to do to judge them also that are without? do not ye judge them that are within? 13 But them that are without God judgeth. Therefore put away from among yourselves that wicked person.
2 Thessalonians 3:6 Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.
2 Thessalonians 3:14 And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed. 15 Yet count him not as an enemy, but admonish him as a brother.
Titus 3:10 A man that is an heretick after the first and second admonition reject;
Unruly Christians are to be put out of fellowship, yet not treated as enemies; the aim is repentance and restitution, not punishment as an end in itself.
The man who committed fornication with his father’s wife is a recorded example.
1 Corinthians 5:1 It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father’s wife. 2 And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you. 3 For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed, 4 In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ, 5 To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
‘To deliver such an one unto Satan’ is a euphemism for ‘put out of fellowship’. ‘The destruction of the flesh’ is a euphemism for ‘the destruction of the fleshly mind’. The aim is that he might repent of the ‘lust’ which caused him to sin, and a ‘spiritual’ mind be restored in him. This is clarified in Romans 8:
Romans 8:12 Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. 13 For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify (put to death/destroy) the deeds of the body, ye shall live.
The man subsequently repented and Paul exhorts the Corinthians to receive him back into fellowship.
2 Corinthians 2:6 Sufficient to such a man is this punishment, which was inflicted of many. 7 So that contrariwise ye ought rather to forgive him, and comfort him, lest perhaps such a one should be swallowed up with overmuch sorrow. 8 Wherefore I beseech you that ye would confirm your love toward him.
I hope you have found this helpful.
May God bless you,