Reference for Berakhot 30:23

תני ר' אושעיא קמיה דרבא וכתבתם הכל בכתב אפילו צואות

Rab Josiah taught in the presence of Raba : "And thou shalt write them" (Deut. vi. 9) means that the whole [of the first two paragraphs of the Shema'] must be written [in the Tefillin], even the words of the commands.

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