It is with great thanks to the Almighty that we present to you this short booklet which contains a quick summary of the necessary laws of Tefillin, especially focusing on those laws relevant during prayer while the Mitzvah of Tefillin is being fulfilled. The purpose of this booklet is for it to be used as a reference guide during prayer to look up a particular law and is hence advised to be kept in one’s outer Tefillin bag. The sources have been allocated from the Shulchan Aruch Harav, Ketzos Hashulchan, Chabad Custom, and from the many works the Achronim. Detailed sources can be found in our corresponding Sefer on the laws of Tefillin, and the referenced sources [i.e. Chapter 3 Halacha 5] refer to it.