Commentary for Berakhot 30:13

וצריכא דאי אשמעינן הלכה כר' יהודה הוה אמינא אפילו לכתחלה קמ"ל הלכה כר' יהודה שאמר משום ר' אלעזר בן עזריה

It is necessary [to state it in this way] ; for if he had informed us only that the Halakah is in accord with R. Judah, I might have supposed [the Shema' need not be read audibly] ab initio ; therefore he tells us that the Halakah is in accord with R. Judah's view which he reported in the name of R. Eleazar b. 'Azariah.

Abraham Cohen Footnotes to the English Translation of Masechet Berakhot