Leviticus 5:4-6

4“If you hastily take a vow about what you will or will not do (as some people do) and then ignore it (although you know what you said), you will be guilty.

5“So if you are guilty of any of these sins, you must confess it.

6Bring your guilt offering to the Lord for the sin you committed. It must be a female sheep or goat as an offering for sin. Then the priest will make peace with the Lord for what you did wrong.