Proverbs 25:9 Debate thy cause with thy neighbour himself; and discover not a secret to another:

Leviticus 19:17 ¶Thou shalt not hate thy brother in thine heart: thou shalt in any wise rebuke thy neighbour, and not suffer sin upon him.

Matthew 18:15 ¶Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.

Matthew 18:16 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.