Answer
Galatians 6:1
Brothers, if anyone is caught in any transgression, you who are spiritual should restore him in a spirit of gentleness. Keep watch on yourself, lest you too be tempted.
Matthew 18:15-17
If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother. But if he does not listen, take one or two others along with you, that every charge may be established by the evidence of two or three witnesses. If he refuses to listen to them, tell it to the church. And if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector.
Galatians 2:11-14
But when Cephas came to Antioch, I opposed him to his face, because he stood condemned. For before certain men came from James, he was eating with the Gentiles; but when they came he drew back and separated himself, fearing the circumcision party. And the rest of the Jews acted hypocritically along with him, so that even Barnabas was led astray by their hypocrisy. But when I saw that their conduct was not in step with the truth of the gospel, I said to Cephas before them all, “If you, though a Jew, live like a Gentile and not like a Jew, how can you force the Gentiles to live like Jews?”
2 Timothy 3:16
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness,
Luke 17:3
Pay attention to yourselves! If your brother sins, rebuke him, and if he repents, forgive him,
2 Timothy 4:2
Preach the word; be ready in season and out of season; reprove, rebuke, and exhort, with complete patience and teaching.
Matthew 7:3-5
Why do you see the speck that is in your brother's eye, but do not notice the log that is in your own eye? Or how can you say to your brother, ‘Let me take the speck out of your eye,’ when there is the log in your own eye? You hypocrite, first take the log out of your own eye, and then you will see clearly to take the speck out of your brother's eye.
Titus 3:10
As for a person who stirs up division, after warning him once and then twice, have nothing more to do with him,
Ephesians 4:15
Rather, speaking the truth in love, we are to grow up in every way into him who is the head, into Christ,
Leviticus 19:17-18
You shall not hate your brother in your heart, but you shall reason frankly with your neighbor, lest you incur sin because of him. You shall not take vengeance or bear a grudge against the sons of your own people, but you shall love your neighbor as yourself: I am the Lord.
2 Thessalonians 3:14-15
If anyone does not obey what we say in this letter, take note of that person, and have nothing to do with him, that he may be ashamed. Do not regard him as an enemy, but warn him as a brother.
James 5:19-20
My brothers, if anyone among you wanders from the truth and someone brings him back, let him know that whoever brings back a sinner from his wandering will save his soul from death and will cover a multitude of sins.
Titus 2:15
Declare these things; exhort and rebuke with all authority. Let no one disregard you.
Galatians 6:1-2
Brothers, if anyone is caught in any transgression, you who are spiritual should restore him in a spirit of gentleness. Keep watch on yourself, lest you too be tempted. Bear one another's burdens, and so fulfill the law of Christ.
Philippians 2:3-4
Do nothing from rivalry or conceit, but in humility count others more significant than yourselves. Let each of you look not only to his own interests, but also to the interests of others.
Matthew 7:1
Judge not, that you be not judged.
Ephesians 4:32
Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you.
Proverbs 27:17
Iron sharpens iron, and one man sharpens another.
Proverbs 27:5
Better is open rebuke than hidden love.
Proverbs 19:11
Good sense makes one slow to anger, and it is his glory to overlook an offense.
Unless otherwise noted, all Bible verses are from The Holy Bible, English Standard Version® Copyright© 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.
Special thanks to OpenBible.info for the data on the most well-known Bible verses.
