two wrongs do not make a right
Definition:  you do not have to avenge yourself to someone just because they did you wrong
Usage:  he cheated on you, that does not imply that you must cheat on him; what will that help? two wrongs do not make a right

SEPEDI
Translation:  diphošo tše pedi ga di dire selo go ba sa nnete
Proverb: kgowa e a lefša

XITSONGA
Translation:  leswi nga hoxeka swimbirhi a swi endli leswinene
Proverb: u nga dyi tinyawa swin’we na timhunti

TSHIVENḒA
Translation:  vhukhakhi vhuvhili a vhu iti tsho lugaho
Proverb: u songo lifhedza tshivhi nga tshivhi