Halakhah sobre Deuteronómio 6:8

תפילין that were written by a slave, or a woman, or a minor - even if he reached [the age of] training [in mitzvot], (or a non-Jew), or a Samaritan, or a transgressor/apostate who served idols, or an informer are invalid because [of what] is written "And you shall bind them as a sign on your hand… and you shall write them on the doorposts of your house" (Deuteronomy 6:8–9): [which is expounded to mean] - All that are not [commanded] in binding or do not believe in it, are not [suitable] for writing.

The commandment of the tefillin of the arm To bind the tefillin of the arm upon the arm, as it is stated (Deuteronomy 6:8), "And you shall bind them as a sign upon your arm." And the explanation comes about this verse, that we bind four sections from the words of the Torah upon our arms. And they are called tefillin when they are bound with straps, as the tradition comes [to explain] about them. And these are these four sections: Two of them are at the end of the Order of Bo el Pharaoh and they are the sections of 'Sanctify your firstborn to me,' until 'you shall keep this statute at its set time from year to year' - which is one section in every exact book [of the Torah]. And the second section is from 'And it shall be when He will bring you,' until the end of the order which finishes [with] 'for with strong-handedness did He take us out of Egypt.' And the third section is at the end of the Order of Ve'etchanan in the Book of Elu HaDevarim (Deuteronomy) - the section of 'Hear Israel,' until 'and in your gates.' And the fourth section is at the end of the Order of Vehaya Ekev - the section of 'And it shall be if you listen,' until 'like the days of the heavens upon the earth.' These four sections are written on one parchment and we roll it like a type of Torah scroll from its end to its beginning. And we place it into a chamber of leather and we pass a strap through one end of the leather. And we bind that leather with the [Torah] sections inside it upon the left upper arm. And since they are bound upon the upper arm, they are resting across from the heart. And they are called tefillin of the arm in every place.

The commandment of the tefillin of the head: To place tefillin on the head, as it is stated (Deuteronomy 6:8), "and they shall be as totafot between your eyes." Behold, I wrote in the previous commandment what is the content of the tefillin, that it is four sections that are written in the Torah, in the Order of Bo el Pharaoh, in the Order of Ve'etchanan and in the Order of Vehaya Ekev. And we were commanded to write these four sections on parchment and to place them on our heads between our eyes and on our upper arm across from the heart. And the matter of these four sections more than other sections of the Torah is because there is in these the acceptance of the yoke of Heaven, the unification of God, and the matter of the exodus from Egypt which forces belief in the creation of the world and the supervision of God over the lower beings - and these are the fundamentals of the Jewish religion. And therefore we were commanded to place these fundamentals between our eyes and upon the board of our hearts all day; as the wise men of science have said that these two limbs are the residence of the intellect. And when we place these things upon them as a memory device, we are strengthened about them, and we add to the cognizance of the ways of God, may He be blessed; and [so] we merit life in the world to come. And some of the laws of the tefillin are written above in that of the arm.