Quotation 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!
Shulchan Arukh, Orach Chayim
From when does one bless on the ציצית [that he puts on] in the morning? From the time when [there's enough light that] one can tell the difference between the techeilet (blue) in it and the white in it. And if he puts it on starting at dawn, some say he makes a blessing, and this is our practice (Mordechi - chapter 2 of Tractate Megillah). And if he put it on earlier than that, such as during [the time of year when we recite] selichot, he should not make a blessing over it [right away], and [then] when it becomes light he should touch [the ציצית] and makes the blessing (Tashbe"tz).
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