Leviticus 5:4-6

ERV(i) 4 or if any one swear rashly with his lips to do evil, or to do good, whatsoever it be that a man shall utter rashly with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these [things]: 5 and it shall be, when he shall be guilty in one of these [things], that he shall confess that wherein he hath sinned: 6 and he shall bring his guilt offering unto the LORD for his sin which he hath sinned, a female from the flock, a lamb or a goat, for a sin offering; and the priest shall make atonement for him as concerning his sin.