Leviticus 5
3 Ref Or if he becomes unclean through touching unconsciously any unclean thing of man, whatever it may be, when it is made clear to him he will be responsible:
4 Ref Or if anyone, without thought, takes an oath to do evil or to do good, whatever he says without thought, with an oath, having no knowledge of what he is doing; when it becomes clear to him, he will be responsible for any of these things.