Leviticus 5:3-5

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;