Leviticus 5:1-5

‘Now if a person sins after he hears a public order to testify when he is a witness, whether he has seen or otherwise known, if he does not tell it, then he will bear his punishment.

Or if a person touches any unclean thing, whether a carcass of an unclean animal, or the carcass of unclean cattle, or a carcass of unclean swarming things, though it is hidden from him and he is unclean, then he will be guilty.

Or if he touches human uncleanness, of whatever sort his uncleanness may be with which he becomes unclean, and it is hidden from him, and then he comes to know it, he will be guilty.

Or if a person swears thoughtlessly with his lips to do evil or to do good, in whatever matter people speak thoughtlessly with an oath, and it is hidden from him, and then he comes to know it, he will be guilty of one of these things.

So it shall be when he becomes guilty of one of these things, that he shall confess that in which he has sinned.