Leviticus 5:3-5

3“Or if he touches some human uncleanness, whatever his filth is by which he is unclean, though it is hidden from him, when he knows of it, then he will be guilty.

4“Or if a person swears rashly with his lips to do evil or to do good—about anything that one might utter rashly by an oath, though it is hidden from him, when he realizes it, then he will be guilty of one of these.

5“So it will be, when one becomes guilty of one of these things, he shall confess about what he has sinned.