Tzitz Vs. Tefillin & Rabenu Tam's Encounter With Moshe Rabenu
Rabbi Mendel Krasnjanski
Tefillin on Shabbos? Distraction with Tefillin/Tzitz on, What's holier, Tefillin or Tzitz? Exposed name of Hashem vs exposed letters shin daled and yud, the three branch and four branch shins Meseches Shabbos, Tosfos, Rambam, Rosh, B"Y, Sefas Emes, Ramban, Shagas Aryeh, Elya Rabba, Barush Sheamar Source Sheet