Leviticus 5:5 WEB

³  ''Or if he touches the uncleanness of man, whatever his uncleanness is with which he is unclean, and it is hidden from him; when he knows of it, then he shall be guilty.

⁴  ''Or if anyone swears rashly with his lips to do evil, or to do good, whatever it is that a man might utter rashly with an oath, and it is hidden from him; when he knows of it, then he shall be guilty of one of these.

⁵  It shall be, when he is guilty of one of these, he shall confess that in which he has sinned:

⁶  and he shall bring his trespass offering to Yahweh for his sin which he has sinned, a female from the flock, a lamb or a goat, for a sin offering; and the priest shall make atonement for him concerning his sin.

⁷  ''If he can't afford a lamb, then he shall bring his trespass offering for that in which he has sinned, two turtledoves, or two young pigeons, to Yahweh; one for a sin offering, and the other for a burnt offering.