Reference for Chullin 238:28

ורבי יוחנן אמר

R'Aha B'Jacob demurred, [saying:] If so, how may we write Tefillin?<span class="x" onmousemove="('comment',' I.e., phylacteries which contain scrolls of parchment with special selected passages written thereon. Cf. Deut. VI, 8.');">¹⁷</span>

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