Leviticus 4:2

2Say to the sons of Israel: The soul which will have sinned through ignorance, and concerning any of the commandments of the Lord that he instructed not to be done, if anything at all has been done:
4:2 Ignorance: To be ignorant of what we are bound to know is sinful; and for such culpable ignorance, these sacrifices, prescribed in this and the following chapter, were appointed.(Challoner)
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