and set two men, sons of Belial, before him, to bear witness against him, saying, ‘You blasphemed God and the king.’ And then carry him out and stone him, so that he will die.”
When a person sins in hearing the spoken oath, and he is a witness, whether he saw or knew about the incident, if he does not report it, he bears guilt.
But the man who is clean, and is not on a journey, and fails to keep the Passover, even the same person will be cut off from his people. Because he did not bring the offering of the Lord at its appointed time, that man will bear his sin.