Tefillin are a set of small black leather boxes containing scrolls of parchment inscribed with verses from the Torah. These boxes are attached to leather straps, and Jewish men traditionally bind them on their head and arm during weekday morning prayers. The practice is a biblical commandment, and the verses inside the tefillin include references to this practice, emphasizing the importance of remembrance and dedication to Hashem.

Tefillin provide special protection for the Jewish people against those who would harm them. This protection is considered to extend beyond the individual wearing the tefillin, offering spiritual safeguarding for the broader community as well.

Checking Tefillin: Just like mezuzot, tefillin are also subject to regular examination to ensure they remain in a kosher state. This examination, known as "checking tefillin," typically occurs at least twice every seven years. It involves verifying that the parchment scrolls inside the tefillin boxes have not been damaged or faded and that the boxes and straps are intact and properly configured. The check ensures that the tefillin are fit for ritual use and continue to serve their religious function correctly. Regular inspections are crucial for maintaining the sanctity and effectiveness of this mitzvah.

Like with mezuzot, the Lubavitcher Rebbe often suggested checking tefillin during special situations to ensure they are kosher. This recommendation is particularly emphasized during times of personal challenge or when seeking divine assistance, such as for health issues or other significant life events. The Rebbe stressed that