Tefillin are arguably not biblical requirements   Rabbis have taught that the command to wear Tefillin is contained in four passages Exodus 13:9, 13:16, and Deuteronomy 6:8-9, and 11:18, and these passages were placed in the Tefillin boxes. The passages do not mention Tefillin but say, quoting Exodus 13:9, “And it shall [...]