Commentary for Berakhot 29:18
יצא מני לא ר' יוסי ולא ר' יהודה דאי ר' יהודה הא אמר לכתחלה נמי יצא אי ר' יוסי דיעבד נמי לא
It can be neither R. Jose's nor R. Judah's. For were it R. Judah's, if the man had said [Grace inaudibly] ab initio he would also have fulfilled his duty ; if R. Jose's, even post factum it cannot be considered that he has done so. How is it then?
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Because the Grace after meals is a Pentateuchal ordinance (see fol. 21a, p. 135), and therefore parallel to the case of the Shema' where R. Jose does not admit as valid even the post factum reading, if inaudible.
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