Leviticus 5:3-5

3A person may touch something that another person has made bad. If he does, he is doing something wrong. He might not know that it is bad, but he is still doing a wrong thing.

4A person is doing a wrong thing if he says any careless promise. The promise might be good or bad. People will tell him that he has not obeyed God's rules. Then he will know that he has sinned.

5A person must tell the priest if he has done any of these things.