Leviticus 5:2-4

Complete Jewish Bible

² If a person touches something unclean, whether the carcass of an unclean wild animal, a domestic animal or a reptile, he is guilty, even though he may not be aware that he is unclean. ³ If he touches some human uncleanness, no matter what the source of his uncleanness is, and is unaware of it, then, when he learns of it, he is guilty. ⁴ If someone allows to slip from his mouth an oath to do evil or to do good, and he doesn’t remember that he clearly spoke this oath, then, no matter what it was about, when he learns of it, he is guilty.