Mateus 18:15-20 - Bíblia Online

"If your brother sins against you, go, show him his fault between you and him alone. If he listens to you, you have gained back your brother. 
But if he does not listen, take one or two more with you, that at the mouth of two or three witnesses every word may be established. 
If he refuses to listen to them, tell it to the church. If he refuses to hear the church also, let him be to you as a Gentile or a tax collector. 
Truly I tell you, whatever things you bind on earth will have been bound in heaven, and whatever things you release on earth will have been released in heaven. 
Again, truly I tell you, that if two of you will agree on earth concerning anything that they will ask, it will be done for them by my Father who is in heaven. 
For where two or three are gathered together in my name, there I am in the midst of them." 

Mateus 19

"If your brother sins against you, go, show him his fault between you and him alone. If he listens to you, you have gained back your brother. 
But if he does not listen, take one or two more with you, that at the mouth of two or three witnesses every word may be established. 
If he refuses to listen to them, tell it to the church. If he refuses to hear the church also, let him be to you as a Gentile or a tax collector. 
Truly I tell you, whatever things you bind on earth will have been bound in heaven, and whatever things you release on earth will have been released in heaven. 
Again, truly I tell you, that if two of you will agree on earth concerning anything that they will ask, it will be done for them by my Father who is in heaven. 
For where two or three are gathered together in my name, there I am in the midst of them." 

Mateus 19