Matthew 18 - NASB

Now if your brother sins, go and show him his fault in private; if he listens to you, you have gained your brother.
Matthew 18:15 sin speaking listening
And if he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, he is to be to you as a Gentile and a tax collector.
Matthew 18:17 church sin listening

For where two or three have gathered together in My name, I am there in their midst.
Matthew 18:20 Jesus community prayer
Then Peter came up and said to Him, “Lord, how many times shall my brother sin against me and I still forgive him? Up to seven times?” Jesus said to him, “I do not say to you, up to seven times, but up to seventy-seven times.”
Matthew 18:21-22 forgiveness neighbor sin