Reference for Zevachim 211:12

וטהור שאכל טמא פטור שאינו חייב אלא על טומאת הגוף:

R'JOSE THE GALILEAN SAID: AN UNCLEAN PERSON WHO EATS CLEAN [SACRIFICES] IS CULPABLE, BUT AN UNCLEAN PERSON WHO EATS UNCLEAN [FLESH OF SACRIFICES] IS NOT CULPABLE. BECAUSE HE ATE ONLY THAT WHICH IS UNCLEAN.