משנה אויף במדבר 5:2

If he became impure while in the Temple court [and was aware of it], and then forgot that he was impure, though he remembered that he was in the Temple; [Or] he forgot that he was in the Temple, though he remembered that he was impure; [Or,] he forgot both; And he prostrated himself, or waited [in the Temple] the time it takes to prostrate; Or went out the long way, he is liable; [If he went out] the shorter way, he is not liable; This is the positive precept concerning the temple for which they [the court] are not liable.

The pesah which comes in impurity: zavin and zavot, menstruant women and women after childbirth do not eat from it, yet if they did eat they are exempt from karet. Rabbi Eliezer exempts [them] even [of the karet normally incurred] for entering the sanctuary.