Maybe you have heard this in some Ciluba songs. This is a famous proverb.
Nnyòka wa bulandà, nnyòka wa bulelà. Kàsu kukusùma, kàsu kukudyà. Bubì nebùlwe àmu kuùdì.
Serpent d’amitié, serpent de parenté. Il ne cherche ni à te mordre ni à te manger. Le mal est en toi.
Friendly snake, related snake. It doesn’t want to bite you or eat you. Evil is inside you.