do not bite the hand that feeds you
Definition:  do not act badly toward the person who has helped you or from whom you derive some benefits, for you may lose those benefits in future
Usage:  don’t bite the hand that feeds you by talking ill of your mentor on such a small issue; if he distances himself from you, it can hurt you bad

SEPEDI
Translation:  o se ke wa loma seatla seo se go fepago
Proverb: mona-le-thaka ga a rogwe

XITSONGA
Translation:  u nga lumi voko leri ku dyisaka
Proverb: u nga hoxi bekara hi maribye

TSHIVENḒA
Translation:  u songo luma tshanḓa tshine tsha u unḓa
Proverb: nyavhumbwa wa dagaila wa kanda vho u vhumbaho