Reference for Yoma 158:7
ואי ס"ד כותבת הגסה שאמרו יתירה מכביצה מכדי ב"ש אשיעורא דנפיש מכזית קא מהדרי ליתני כביצה ואי נמי כי הדדי נינהו ניתני כביצה אלא לאו שמע מינה כותבת פחותה מכביצה
R'Zebid said: The big date whereof they spoke is smaller in size than an egg, for we learned: Beth Shammai say: 'Of leaven as much as an olive, or leavened bread as much as a date'.<span class="x" onmousemove="('comment',' The minimum, the possession of which during Passover causes one to transgress the prohibition. Ex. XII, 19: Seven days shall there be no leaven found in your houses, and XIII, 7: And there shall be no leavened bread seen with thee, neither shall there be leaven seen with thee, in all thy borders. V. Bez. 2a.');"><sup>7</sup></span> And thereon we were debating; what is the reason of Beth Shammai?
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