Reference for Pesachim 73:1

ובית הלל מתירין וכמה פת עבה א"ר הונא טפח שכן מצינו בלחם הפנים טפח

but Beth Hillel permit it. And how much is a thick loaf?<span class="x" onmousemove="('comment',' Which Beth Hillel permit.');">¹</span> Said R'Huna, A handbreadth, because thus we find in the case of the shewbread [that it was] a handbreadth.<span class="x" onmousemove="('comment',' Though the shewbread was unleavened (Men. 27a) .');">²</span>

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