תפילין - מצווה אחת או שתי מצוות

§ Rav Ḥisda says: If one spoke between donning the phylacteries of the arm and the phylacteries of the head, he must recite the blessing again when donning the phylacteries of the head. The Gemara notes: One can infer that if he spoke, yes, he must recite a blessing when donning the phylacteries of the head, but if he did not speak, he does not recite a blessing. The Gemara challenges this: But Rav Ḥiyya, son of Rav Huna, sent a ruling in the name of Rabbi Yoḥanan: On the phylacteries of the arm one says the blessing: Blessed are You, Lord our God, King of the Universe, Who has sanctified us through His mitzvot and commanded us to don phylacteries. On the phylacteries of the head one says the blessing: Blessed are You, Lord our God, King of the Universe, Who has sanctified us through His mitzvot and commanded us concerning the mitzva of phylacteries. Abaye and Rava both say: Rabbi Yoḥanan meant that if one did not speak, he recites one blessing; if he spoke, he recites two blessings.

If he did not talk - He only blesses on that of the hand alone.

If he talked he says two blessings - Like Rav Chiya sent.

If he did not talk he says one blessing, if he talked he says two - Rashi explains: If he did not talk he says one blessing - for both that of the hand and that of the head. If he talked, he says two blessings - "To lay the Tefillin" for that of the hand, and "concerning the precept of Tefillin" for that of the head. But Rabbeinu Tam explained: If he did not talk, he says one blessing - On that of the head he says (only one blessing) for that of the head: "Concerning the precept of tefillin," because that is its blessing. If he spoke he says two blessings - for that of the head: "to lay" and "concerning the precept of." And it is also written like this in the Shimusha Rabba D'Tfillin. This is the teaching of my teacher and master.

That is that He commanded us to put on the head tefillin. And that is His saying, "and they shall be for symbols between your eyes" (Deuteronomy 6:8). And this command has already been repeated four times. (See Parashat Bo, Vaetchanan and Ekev; Mishneh Torah, Tefillin, Mezuzah and the Torah Scroll 1.)

That is that He commanded us to put on the hand tefillin. And that is His saying, "And you shall tie them as a sign upon your hand" (Deuteronomy 6:8). And this command was already repeated four times. And the proof that the head tefillin and the hand tefillin are two commandments is their saying in the Gemara (Menachot 44a) in surprise at one who thinks that one not put on the head tefillin or the hand tefillin without the other, but rather only if they are both together - and this is the language of the statement - "one who does not have two commandments, should he also not do the one commandment?" This means to say, should one who cannot do two commandments not do the one - that is not the case, but rather he should do the one commandment that presents itself. Hence he should put on either one of them that presents itself to him. Behold it has been made clear to you that they called the hand tefillin and the head tefillin, two commandments. And these two commandments are not obligatory for women on account of His, may He be exalted, saying, as a reason for their obligation, "in order that the Torah of the Lord may be in your mouth" (Exodus 13:9) - and women are not obligated in Torah study. And so did they explain in the Mekhilta. And likewise did they explain all the regulations of these two commandments in the fourth chapter of Menachot. (See Parashat Bo, Vaetchanan and Ekev; Mishneh Torah, Tefillin, Mezuzah and the Torah Scroll 1.)

The [absence of the] head tefillah does not preclude [wearing tefillin] on the arm, and similarly, the [absence of the] arm tefillah does not preclude [wearing tefillin] on the head. They are two mitzvot, each one to be considered independently.What blessings are recited? On the head tefillin, one recites: "[Blessed are You...] who has sanctified us with His commandments and commanded us concerning the mitzvah of tefillin." On the arm tefillin, one recites: "[Blessed are You...] who has sanctified us with His commandments and commanded us to put on tefillin."

When does the above apply? When one puts on only one of them. If, however, one puts them both on, one recites only a single blessing, "...to put on tefillin."One should tie the tefillin on one's arm, and afterwards put on the head tefillin. When one removes them, the head tefillin should be removed, and then the arm tefillin.

It is forbidden to make an interruption with speaking between [putting on] the arm tefillin and the head tefillin, and if he spoke, he must recite the blessing on the head tefillin: "...on the Mitzvah of Tefillin".

That is that He commanded us to count forty-nine days from the harvesting of the omer. And that is His, may He be exalted, saying, "you shall count for yourselves seven weeks from the morrow of the Shabbat, etc." (Leviticus 23:15). And you should know that just like the court is obligated to count the years of the Jubilee, year by year [and] cycle by cycle - as we explained in what came previously (Sefer Hamitzvot, Positive Commandments 140) - so too is each and every one of us obligated to count the days of the omer, day by day and week by week. And that is His having said, "you must count fifty days" (Leviticus 23:16), and "Seven weeks shall you count for yourself" (Deuteronomy 16:8). And just like the commandment of counting the years and the sabbatical cycles is one commandment - as we explained - so too is the counting of the omer, one commandment. And do not be fooled by their saying (Menachot 66a), "It is a commandment to count days and it is a commandment to count weeks," and think that they are two commandments. For it is a commandment to do each and every part of commandments that have have different parts. However had they said, "From where [do we know that] the days are a commandment; and from where [do we know that] the weeks are a commandment" - it would have been two commandments. And this will not be lost on the one that will not be fooled by the words. Since were you to say, "It is an obligation to do such and such," it surely does not necessarily make that action a separate commandment. And the clear proof for this is our counting every night that it is such and such weeks and such and such days. And were it to be a separate commandment, we would only arrange its content on the night of Shavuot; and we would say two blessings - on the counting of the omer; and on the counting of the weeks of the omer. But the things are not like this. Rather the commandment is counting the omer daily and weekly [together], as they ordained. And women are not obligated in this commandment. (See Parashat Emor; Mishneh Torah, Daily Offerings and Additional Offerings 10.)