The Rambam paskens that chametz is assur less than a kezayis, an olive because of lo yeochel chametz. They ask why we need an extra pasuk and use like Rebbi Yochanan who forbids it all over from kol chelev. Answers the Noda Beyehudah that it is required for the last day of Pesach when chaze leitztarifa, being able to axxumulate by eating more does not apply. The Chasam Sofer, whose yahr tzeit happens to be today, says in Toras Moshe, that had Adam Harishan waited until shabbos of eating from the eitz hadaas, the forbidden fruit would have been allowed. Maybe the strength of shabbos would have swayed him towards the good. Similarly Adam Harishon ate it Friday at the end of the day, so if he ate more, he was allowed by justifying himself, I ate a small amount and will be allowed to eat more as it will not accumulate.
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