Leviticus 5:4–6

4 Or if someone swears rashlyv to do what is good or evil—concerning anything a person may speak rashly in an oath—without being aware of it, but later recognizes it, he incurs guilt in such an instance.

5 If someone incurs guilt in one of these cases, he is to confessa he has committed that sin. 6 He must bring his penalty for guiltb for the sin he has committed to the Lord: a female lamb or goat from the flock as a sin offering. In this way the priest will make atonementc on his behalf for his sin.