JOEL - Their are three reasons for imposing church discipline on members of the church who have sinned:

1. To save the Souls of Transgressors
2. To protect the innocent
3. To safeguard the Integrity of the Church

There are some scriptural references that support the Church discipline process in achieving these goals.
Speaking of those who commit a crime against another, Jesus said:

"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."(Matt 18:15-17)

Speaking of the disobedient, Paul said:

"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.(2 Thes. 3:14)

Most of our instruction from God concerning matters of church discipline are found in modern-day scriptures:

"Thou shalt not commit adultery; and he that committeth adultery, and repenteth not, shall be cast out."(D&C 42:24)

"And it shall come to pass, that he that sinneth and repenteth not shall be cast out of the church, and shall not receive again that which he has consecrated unto the poor and the needy of my church, or in other words, unto me" (D&C 42:37; See also verses 74-93)

"And him that repenteth not of his sins, and confesseth them not, ye shall bring before the church, and do with him as the scripture saith unto you, either by commandment or by revelation. And this ye shall do that God may be glorified-not because ye forgive not, having not compassion, but that ye may be justified in the eyes of the law, that ye may not offend him who is your lawgiver"(D&C 64:12-13)

"For what shepherd is there among you having many sheep doth not watch over them, that the wolves enter not and devour his flock? And behold, if a wolf enter his flock doth he not drive him out? Yea, and at the last, if he can, he will destroy him."(Alma 5:59)

"We believe that all religious societies have a right to deal with their members for disorderly conduct, according to the rules and regulations of such societies; provided that such dealings be for fellowship and good standing; but we do not believe that any religious society has authority to try men on the right of property or life, to take from them this world’s goods, or to put them in jeopardy of either life or limb, or to inflict any physical punishment upon them. They can only excommunicate them from their society, and withdraw from them their fellowship." (D&C 134:10)

Bishops' responsibilities:

"And also to be a judge in Israel, to do the business of the church, to sit in judgment upon transgressors upon testimony as it shall be laid before him according to the laws, by the assistance of his counselors, whom he has chosen or will choose among the elders of the church.
This is the duty of a bishop who is not a literal descendant of Aaron, but has been ordained to the High Priesthood after the order of Melchizedek.
Thus shall he be a judge, even a common judge among the inhabitants of Zion, or in a stake of Zion, or in any branch of the church where he shall be set apart unto this ministry, until the borders of Zion are enlarged and it becomes necessary to have other bishops or judges in Zion or elsewhere."(D&C 107:72-74)

"And whoso standeth in this mission is appointed to be a judge in Israel, like as it was in ancient days, to divide the lands of the heritage of God unto his children;
And to judge his people by the testimony of the just, and by the assistance of his counselors, according to the laws of the kingdom which are given by the prophets of God." (D&C 58:17-18)

The process on how Church disciplinary councils are conducted is described in D&C 102.