Tefillin
Tefillin, known in English as phylacteries, consist of two small black leather boxes containing parchment scrolls inscribed with four biblical passages from Exodus and Deuteronomy, worn by observant adult Jewish males on the left arm and forehead during weekday morning prayers.[1][2] The arm tefillin (shel yad) features a single compartment housing all four scrolls, secured opposite the heart with leather straps wound around the arm and hand in a specific pattern, while the head tefillin (shel rosh) has four separate compartments and is positioned above the hairline as frontlets.[1][3] This practice fulfills Torah commandments to bind God's words as a sign upon the hand and between the eyes, interpreted literally in rabbinic tradition as a physical reminder of divine directives and covenantal obligations.[3][4] Archaeological evidence, including leather phylacteries from Qumran dated to the Second Temple period, confirms the antiquity of the custom, though ancient examples were typically undyed rather than the black stipulated in later halakhic codes.[5][6] In Orthodox Judaism, donning tefillin symbolizes intellectual and emotional commitment to Torah observance, with the ritual omitted on Sabbaths and festivals due to their inherent sanctity superseding the need for such signs.[1][7]