Leviticus 5:4-6

New Revised Standard Version Catholic Edition

⁴ Or when any of you utter aloud a rash oath for a bad or a good purpose, whatever people utter in an oath, and are unaware of it, when you come to know it, you shall in any of these be guilty. ⁵ When you realize your guilt in any of these, you shall confess the sin that you have committed. ⁶ And you shall bring to the Lord, as your penalty for the sin that you have committed, a female from the flock, a sheep or a goat, as a sin offering; and the priest shall make atonement on your behalf for your sin.