Commentary for Berakhot 46:8
אי הכי הא דקתני עלה זהו ק"ו שאין עליו תשובה מאי אין עליו תשובה דרכא דמילתא הכי איתא אלא לאו תפילין ותיובתא דרבא אמר רב ששת
If this be so, that which is mentioned in the sequel, viz. "This is an argument a fortiori which cannot be refuted" — what means it cannot be refuted? It is a natural proceeding! Quite so; [therefore the quoted statement must refer to] the Tefillin, and the refutation of Raba in the name of Rab Sheshet
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
For a man to uncover in front and a woman behind, and there is no argument a fortiori here at all. Consequently we cannot find anything to which the quoted statement "What I have permitted thee" etc. can be made to refer except the Tefillin.
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