fool me once, shame on you; fool me twice, shame on me
Definition:  if you were once tricked or deceived you must be careful not to trust that person again
Usage:  after her boyfriend cheated on her, she forgave him. after cheating for the second time, she told him ‘fool me once, shame on you; fool me twice, shame on me’; she then broke up with him for good

SEPEDI
Translation:  ntlaetše gatee, dihlong di go wena; ntlaetše gabedi, dihlong di go nna
Proverb: ya boela pitšeng e a swa

XITSONGA
Translation:  u ndzi phuntisa kan’we, aredzi wena; u ndzi phuntisa kambirhi, aredzi mina
Proverb: sukumbela yi ndzi luma kan’we

TSHIVENḒA
Translation:  mphure luthihi, u shonedzwa ndi hau; mphure luvhili, u shonedzwa ndi hanga
Proverb: mbuelela i a ḽa