Commentary for Berakhot 29:14
עד כאן לא קאמר ר' יוסי לא יצא אלא גבי ק"ש דאורייתא אבל תרומה משום ברכה הוא וברכה דרבנן ולא בברכה תליא מילתא
[not translated] Only in the matter of the reading of the Shema, which is an ordinance of the Torah, does R. Jose say that the man has not fulfilled his obligation ; but in the matter of Terumah [the deaf man would have fulfilled it], because it is a question of saying the benediction and the saying of the benediction is ordained by the Rabbis, and [the validity of the Terumah] is not dependent upon the benediction.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
R. Jose's objection to inaudibility does not apply to the benediction of Terumah, because it is not so essential a feature of the act, that without it the whole would be illegitimate.
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