Is there a brachah that should be said before tying knots on the tefillin shel yad and rosh, similar to way there is in Gemara a brachah before tying tzitzis? (The brachah is ברוך אתה ה' אלקינו מלך העולם, אשר קדשנו במצותיו וצונו לעשות ציצת, also you say לשם מצות ציצת)
there is a brachah before tying tzitzis? (The brachah is ברוך אתה ה' אלקינו מלך העולם, אשר קדשנו במצותיו וצונו לעשות ציצת
It seems from the Gemara in Menachot 42a that this Bracha is not ruled (this Beracha is said according to Rav Chisda who stated that Tsitsit Chovat Talit (an obligation resting upon the garment).) because we stated as Rav Nachman that Tsitsit is Chovat Gavra (an obligation incumbent upon the person). But concerning Tefilin there is no Machloket that it is an obligation incumbent upon the person and the Mitsva is not ended before the Hanacha.
R' Nahman once found R'Adda B'Ahabah inserting the threads [in a garment] and reciting the blessing '[Blessed art thou.
and hast commanded us] to make the zizith', whereupon he said, 'What is this zizi that I hear?
Thus said Rab: When making the zizith no blessing is to be pronounced'.
42b: Over the hand-tefillah one must say, 'Blessed.
who hast sanctified us by thy commandments and hast commanded us to put on the tefillin'.
Over the head-tefillah one must say, 'Blessed.
who hast sanctified us by thy commandments and hast given us command concerning the precept of the tefillin'.
But one never says, '[Blessed.
and hast commanded us] to make the tefillin!' - Indeed this is the true principle: Wherever a precept is completed by a single act,
Rambam, Ahava, Brachot, 11, 8:
Whenever the performance of a mitzvah constitutes the completion of one's obligation, he should recite the blessing before performing it. When, however, there is another commandment that follows the performance of a particular mitzvah, the blessing should not be recited until the other mitzvah is performed.
What is implied? When a person makes a sukkah, a lulav, a shofar, tzitzit (see SA OC 19, 1), tefillin, or a mezuzah, he should not recite a blessing at the time he made [them]: [praising God for] "sanctifying us with Your commandments and commanding us to make a sukkah" or "a lulav," or "to write tefillin," because there is another commandment that follows this action.
When is the blessing recited? When one sits in the sukkah, shakes the lulav, hears the sounding of the shofar, wraps oneself in tzitzit, dons tefillin, or affixes the mezuzah. In contrast, when one constructs a guardrail, before constructing it one should recite the blessing "...who has sanctified us with Your commandments and commanded us to construct a guardrail." The same applies in all similar situations.