Main point summary
It is our responsibility to lovingly confront a brother for his sin and in cases of continual and unrepentant sin we have heavenly warrant to remove him from Church fellowship.
m “If your brother sins against you,
n go and tell him his fault, between you and him alone.
If he listens to you,
you have o gained your brother.
But if he does not listen,
take one or two others along with you,
that every charge may be established
p by the evidence of two or three witnesses.
If he refuses to listen to them,
q tell it to the church.
And if he refuses to listen even to the church,
r let him be to you as s a Gentile and s a tax collector.
Truly, I say to you, t whatever you bind on earth shall be bound in heaven,
and whatever you loose on earth shall be loosed 1 in heaven.
Again I say to you, if two of you u agree on earth about anything they ask,
v it will be done for them
by my Father in heaven.
For where two or three are w gathered in my name,
x there am I among them.”
1 Corinthians 5:4b says almost the exact same thing and in a very similar context. Both are dealing with Church Discipline. "gathered in my name"