Reference for Chullin 215:1

כל הסריקין אסורין וסריקי בייתוס מותרין

All cakes are forbidden but the cakes of Boethius are permitted!<span class="x" onmousemove="('comment',' I.e., all people may not wash their clothes on the intermediate days of the festival but this man may.');">¹</span>

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