Leviticus 5:2-7

2Or if any one touch any unclean thing, whether it be the carcase of an unclean beast, or the carcase of unclean cattle, or the carcase of an unclean crawling thing, and it be hid from him, — he also is unclean and guilty;

3or if he touch the uncleanness of man, any uncleanness of him by which he is defiled, and it be hid from him, when he knoweth [it], then he is guilty.

4Or if any one swear, talking rashly with the lips, to do evil or to do good, in everything that a man shall say rashly with an oath, and it be hid from him, when he knoweth [it], then is he guilty in one of these.

5And it shall be, when he shall be guilty in one of these, that he shall confess wherein he hath sinned;

6and he shall bring his trespass-offering to Jehovah for his sin which he hath sinned, a female from the small cattle, a sheep or doe goat, for a sin-offering; and the priest shall make atonement for him [to cleanse him] from his sin.

7And if his hand be not able to bring what is so much as a sheep, then he shall bring for his trespass which he hath sinned two turtle-doves or two young pigeons, to Jehovah; one for a sin-offering, and the other for a burnt-offering.