A [person who is] tamei who eats holy [foods], one who enters the Temple while tamei; one who eats fat, blood, leftover [sac-rificial meat], pig-gul, or [sacrificial foods which have become] tamei; one who slaughters [a sacrificial animal] or offers [it] up outside [the Temple]; one who eats chametz on Pesach; one who eats or performs work on Yom Kippur; one who compounds [anointing] oil, com-pounds incense, or anoints with the anointing oil; one who eats neveilos, treifos, abominable creatures, and crawling things.  One who eats tevel, or maaser rishon from which terumah was not separated, or maaser sheni or consecrated objects which were not redeemed. How much must he eat of tevel to be liable? R' Shimon says: Any amount. The Sages [however] say: The bulk of an olive. Said R' Shimon to them: Do you not concur with me concerning one who eats an ant of any size that he is liable? They replied: Because it is as it was created. He replied: One wheat kernel, too, is as it was created.