Halakhah for Berakhot 30:6
במאי אוקימתא כר"י ודיעבד אין לכתחלה לא אלא הא דתני ר"י בריה דר' שמעון בן פזי חרש המדבר ואינו שומע תורם לכתחלה
Having demonstrated that [the Mishnah about the reading of the Megillah] is in accord with R. Judah and post factum it is permissible, but not ab initio, what, however, of the teaching of R. Judah, the son of R. Simeon b. Pazzi : A deaf person who speaks but cannot hear may separate the Terumah ab initio ? Whose view is that?
Peninei Halakhah, Women's Prayer
In addition to kavana, one must pronounce the words of Shema precisely, taking care not to slur any letter, harden soft sounds, or soften hard ones. Therefore, le-khatḥila, one should distinguish between an alef and an ayin, a khaf and a ḥet, a kamatz and a pataḥ, and a tzeirei and a segol (SA 61:14-23). The Sages say, “If one recites Shema and is careful to pronounce its letters exactly, Hell is cooled for him” (Berakhot 15b). Be-di’avad, if she did not recite Shema meticulously, she nevertheless fulfilled her obligation as long as she did not miss a word or a full syllable (SA 62:1; MB 1).
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