Quotation for Berakhot 18:1
אותו צדיק (בראשית טו, יג) ועבדום וענו אותם קיים בהם ואחרי כן יצאו ברכוש גדול לא קיים בהם
[the righteous one] 'And they shall serve them, and they shall afflict them' (Gen. xv. 13) He did fulfil in them, but 'and afterward shall they come out with great substance' (ibid. v. 14) He did not fulfil in them."
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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