"If your brother done you wrong, Take him to yourself alone; Tell him brother you done treated me wrong. You fight on, you fight on, with your sword in your hand, You fight on, yes, you fight on, Lawdy you fight on...."
This appears to me to be based -- very loosely -- on Matt. 18:15: "If a brother sins [against you], bring it to his attention when the two of you are alone."
Note: the words "against you" are omitted by the two oldest manuscripts. - RBW