Related for Berakhot 18:25
מכדי האי יהיו לרצון אמרי פי משמע לבסוף ומשמע מעיקרא דבעינא למימר מ"ט תקנוהו רבנן לאחר י"ח ברכות לימרו מעיקרא
Since the verse : "Let the words of my mouth be acceptable before Thee" might with equal propriety be said at the conclusion or the commencement [of the Tefillah], why did the Rabbis institute it at the end of the Eighteen Benedictions? Let it be said at the commencement!
Tosefta Berakhot
From when do we read the Shema in the morning? Acherim (Others) say, “[from the time] when his friend will be four amot away from him and he recognizes him.” The mitzvah [to say it] is with sunrise in order to connect redemption (Geulah) to prayer (Tefillah), and it will come out that he will pray during the day. Rebbi Yehudah said, “One time I was walking behind Rebbi Akiva and Rebbi Elazar Ben Azaryah and the time came to read the Shema. I supposed they gave up on reading the Shema [right away] because they were busy with the needs of the community. I read [the Shema] and [then] learned [some Torah] and after that they began [reading the Shema], and the sun could already be seen above the mountain tops.”
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