Question 85: How is the kingdom of heaven shut and opened by christian discipline?

Answer: Thus: when according to the command of Christ, those, who under the name of christians, maintain doctrines, or practices inconsistent therewith, and will not, after having been often brotherly admonished, renounce their errors and wicked course of life, are complained of to the church, or to those, who are thereunto appointed by the church; and if they despise their admonition, are by them forbidden the use of the sacraments; whereby they are excluded from the christian church, and by God himself from the kingdom of Christ; and when they promise and show real amendment, are again received as members of Christ and his church. (a)

(a) Matt.18:15-18 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. 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. 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. Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
1 Cor.5:2-5 And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you. 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, In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ, 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.
1 Cor.5:11 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.
2 Thess.3:14-15 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. Yet count him not as an enemy, but admonish him as a brother.
2 Cor.2:6-8 Sufficient to such a man is this punishment, which was inflicted of many. So that contrariwise ye ought rather to forgive him, and comfort him, lest perhaps such a one should be swallowed up with overmuch sorrow. Wherefore I beseech you that ye would confirm your love toward him.