Reference for Berakhot 29:17

במאי אוקימתא כר' יוסי ואלא הא דתניא לא יברך אדם בהמ"ז בלבו ואם בירך

Having demonstrated that [the Mishnah about Terumah] is in accord with R. Jose, what, however, of the following ? There is a teaching: A man must not say the Grace after meals in his heart [inaudibly] ; but if he has done so, he has fulfilled his obligation. Whose view is this?

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