Reference for Menachot 70:10

אמר רב שמואל בר בידרי אמר רב ואמרי לה אמר ר' אחא אריכא אמר רב הונא ואמרי לה אמר רב מנשיא אמר שמואל תפילין מאימתי מברך עליהן משעת הנחתן איני והא אמר רב יהודה אמר שמואל כל המצות כולן מברך עליהן עובר לעשייתן אביי ורבא דאמרי תרוייהו משעת הנחה ועד שעת קשירה

so that Israel be high up and not low down. Moreover, it should face the front, so that Israel be in front and not behind. R'Samuel B'Bidri said in the name of Rab (according to some, R'Aha Arika said it in the name of R'Huna, whilst according to others, R'Menashya said it in the name of Samuel) , When must one recite the blessing over the tefillin? As soon as they have been put on. But this cannot be, for has not Rab Judah said in the name of Samuel that with regard to all precepts the blessing must be recited prior to the performance thereof? - Abaye and Raba both said, It means, from the time they have been put on until they have been tied.<span class="x" onmousemove="('comment',' For as long as they have not been tied the precept is not yet performed.');">¹⁷</span>

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