Tefillin, Mezuzah, v'Sefer Torah

HILCHOT TEFILLIN UMEZUZAH V'SEFER TORAH
THE LAWS [GOVERNING] TORAH SCROLLS, TEFILLIN, AND MEZUZOT

They contain five positive commands, which are: 1) For tefillin [to be placed] on our heads; 2) To tie [tefillin] on our arms; 3) To affix a mezuzah at the entrances to our gates; 4) For every man to write a Torah scroll for himself; 5) For a king to write a second scroll for himself so that he will have two Torah scrolls.

The explanation of these mitzvot is contained in the following chapters.