Such as are found to be ignorant or scandalous, notwithstanding their profession of the faith, and desire to come to the Lord’s supper, may and ought to be kept from that sacrament, by the power which Christ hath left in his church,[1] until they receive instruction, and manifest their reformation.[2]
1 Cor. 11:27-31It is actually reported that there is sexual immorality among you, and of a kind that is not tolerated even among pagans, for a man has his father’s wife.2And you are arrogant! Ought you not rather to mourn? Let him who has done this be removed from among you.
3For though absent in body, I am present in spirit; and as if present, I have already pronounced judgment on the one who did such a thing. 4When you are assembled in the name of the Lord Jesus and my spirit is present, with the power of our Lord Jesus, 5you are to deliver this man to Satan for the destruction of the flesh, so that his spirit may be saved in the day of the Lord.
6Your boasting is not good. Do you not know that a little leaven leavens the whole lump? 7Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed. 8Let us therefore celebrate the festival, not with the old leaven, the leaven of malice and evil, but with the unleavened bread of sincerity and truth.
9I wrote to you in my letter not to associate with sexually immoral people—10not at all meaning the sexually immoral of this world, or the greedy and swindlers, or idolaters, since then you would need to go out of the world. 11But now I am writing to you not to associate with anyone who bears the name of brother if he is guilty of sexual immorality or greed, or is an idolater, reviler, drunkard, or swindler—not even to eat with such a one. 12For what have I to do with judging outsiders? Is it not those inside the church whom you are to judge? 13God judgest those outside. “Purge the evil person from among you.”
Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty concerning the body and blood of the Lord. 28Let a person examine himself, then, and so eat of the bread and drink of the cup. 29For anyone who eats and drinks without discerning the body eats and drinks judgment on himself. 30That is why many of you are weak and ill, and some have died.31But if we judged ourselves truly, we would not be judged.Matt. 7:6
Do not give dogs what is holy, and do not throw your pearls before pigs, lest they trample them underfoot and turn to attack you.Jude 1:23
Save others by snatching them out of the fire; to others show mercy with fear, hating even the garmentstained by the flesh.I Tim. 5:22
Do not be hasty in the laying on of hands, nor take part in the sins of others; keep yourself pure.
…so you should rather turn to forgive and comfort him, or he may be overwhelmed by excessive sorrow.
Question 173, Westminster Larger Catechism