Matthew 18:14-18

So it is not the will of your Father who is in heaven that one of these little ones be lost. “If your brother sins, go and show him his fault in private; if he listens and pays attention to you, you have won back your brother. But if he does not listen, take along with you one or two others, so that EVERY WORD MAY BE CONFIRMED BY THE TESTIMONY OF TWO OR THREE WITNESSES. If he pays no attention to them [refusing to listen and obey], tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile (unbeliever) and a tax collector. [Lev 19:17; Deut 19:15] I assure you and most solemnly say to you, whatever you bind [forbid, declare to be improper and unlawful] on earth shall have [already]been bound in heaven, and whatever you loose [permit, declare lawful] on earth shall have [already] been loosed in heaven. [Matt 16:19]