Mambo Ya Walawi 5:1

“ ‘Ikiwa mtu atakuwa ametenda dhambi kwa sababu hakusema alipotakiwa kutoa ushahidi hadharani kuhusu jambo aliloona au kujua habari zake, yeye anastahili adhabu.

And if a soul sin, and hear the voice of swearing, and is a witness, whether he hath seen or known of it; if he do not utter it, then he shall bear his iniquity.