Reference for Pesachim 87:7

וכזית בכדי אכילת פרס דאורייתא היא א"ל אין

And Rabbah B'Bar Hanah answered: What is the reason? Because a lay Israelite is flagellated on its account for [eating] as much as an olive.<span class="x" onmousemove="('comment',' Hence it is not regarded as nullified, in spite of its subsidiary nature.');">⁸</span>

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