Mambo Ya Walawi 5:4

“ ‘Au kama mtu ameapa kufanya kitu chochote bila kufikiri, kiwe chema au kibaya, kwa vyovyote mtu aweza kuapa bila kujali, hata akiwa hana habari, atakapofahamu atakuwa na hatia.

Or if a soul swear, pronouncing with his lips to do evil, or to do good, whatsoever it be that a man shall pronounce with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these.