text: Matthew 18:15ff and Galatians 6 are the clearest NT references.  \n\nBut there are more.  One very good one is the often missed original setting of the "second greatest commandment" --\n\nLeviticus 19:17-18\nDo not hate your brother in your heart. Rebuke your neighbor frankly so you will not share in his guilt.\nDo not seek revenge or bear a grudge against one of your people, but love your neighbor as yourself. I am the LORD. \n\nAlong the same lines is a set of instructions by Paul in\nEphesians 4:25-27 Therefore each of you must put off falsehood and speak truthfully to his neighbor, for we are all members of one body. "In your anger do not sin"[=Psalm 4:4]: Do not let the sun go down while you are still angry, and do not give the devil a foothold.\n\nThis echoes Paul's call in v.15 to "Tell the truth in love." as part of building up the body in love (and avoiding deceit and error).\n\nFor some reason many separate the warning about anger from the call to be truthful.  But I believe they are intended to be read together.  As in Leviticus 19 the warning is against keeping it to yourself and nursing a grudge rather than correcting and RESTORING your brother and (in the case of sin BETWEEN you), of reconciling/making peace/restoring the RELATIONSHIP (cf. Matthew 5:23-24 which looks at the other side, calling us to go seek restoration if someone has something against US).  \n\nNote: the purpose must NOT be to "get it off my chest", for my own sake [so I won't be a hypocrite?]  It's about not allowing your brother to continue in sin without warning or seeking to restore him [thus we tell him as an expression of LOVING our neighbor] and the related sin of allowing a grudge to fester in my heart.  This is were the Galatians 6 call to be gentle & humble comes in.\n\nAlso note that there is not some generalized command to bring EVERY sin to people's attention!   It is for the sake of that person's good, for the health of the body, for restoration and reconciliation...    There are MANY sins for which the final word should be "Love covers a multitude of sins." (1 Peter 4:8)