Leviticus 5:2-7

2“Or if a person touches any unclean thing—whether it is the carcass of an unclean animal or the carcass of unclean livestock or the carcass of unclean creeping things, though it is hidden from him, still he is unclean and he will be guilty.

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.

6Then he is to bring his trespass offering to Adonai for his sin that he committed: a female from the flock, a lamb or a goat, as a sin offering. So the kohen is to make atonement for him over his sin.

7“But if one cannot afford a lamb, then he shall bring, as his trespass offering for the sin he committed, two turtledoves or two young pigeons, to Adonai. One is for a sin offering and the other for a burnt offering.