Reference for Berakhot 28:20

אימר דאמר רבי יהושע בן קרחה להקדים קריאה לקריאה קריאה לעשיה מי שמעת ליה

R. Joshua b. Karhah certainly said that the reading [of the yoke of heaven, i.e. "Hear O Israel"] is to precede the reading [of the yoke of the commandments, i.e. "And it shall come to pass"] ; but hast thou heard him say that the reading [of the Shema'] should precede the performance [of the duty of Tefillin] ?

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