Mateus 18:15-20 - Bíblia Online

"If your brother sins against you, go and show him his fault between yourself and him alone. If he listens to you, you have won over your brother. 
If he does not listen to you, take along with you one or two more, that at the mouth of two witnesses, or three, every word may be confirmed. 
If he refuses to hear them, tell it to the church. If he refuses to hear the church, let him be to you as a Gentile or a tax collector. 
I tell you truly, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. 
"Again I tell you that, if two of you agree on earth regarding any matter, whatever they pray for will come to them from my Father in heaven. 
For where two or three are gathered in my name, there am I in the midst of them." 

Mateus 19

"If your brother sins against you, go and show him his fault between yourself and him alone. If he listens to you, you have won over your brother. 
If he does not listen to you, take along with you one or two more, that at the mouth of two witnesses, or three, every word may be confirmed. 
If he refuses to hear them, tell it to the church. If he refuses to hear the church, let him be to you as a Gentile or a tax collector. 
I tell you truly, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. 
"Again I tell you that, if two of you agree on earth regarding any matter, whatever they pray for will come to them from my Father in heaven. 
For where two or three are gathered in my name, there am I in the midst of them." 

Mateus 19