Pesachim9: 4
הַפֶּסַח שֶׁבָּא בְטֻמְאָה, לֹא יֹאכְלוּ מִמֶּנּוּ זָבִין וְזָבוֹת, נִדּוֹת וְיוֹלְדוֹת; וְאִם אָכְלוּ — פְּטוּרִים מִכָּרֵת.  רַבִּי אֱלִיעֶזֶר פּוֹטֵר אַף עַל בִּיאַת מִקְדָּשׁ.
[If] the pesach was offered in a state of contamination, zavim, zavos, menstruants, or women after childbirth may not eat of it; but if they did eat, they are exempt from [the penalty of] kares.  R' Eliezer exempts [them] even [from the kares due] for entering the Temple.