Commentary for Menachot 86:1
האי אשר תכסה בה מאי עבדי ליה מיבעי להו לכדתניא (דברים כב, יב) על ארבע כנפות כסותך ארבע ולא שלש
for what purpose do they use the expression 'Wherewith thou coverest thyself'? - They require it for the following Baraitha that was taught: Upon the four corners of thy covering;<span class="x" onmousemove="('comment',' Deut. XXII, 12.');"><sup>1</sup></span> four, but not three.<span class="x" onmousemove="('comment',' I.e., a three-cornered garment is not subject to zizith.');"><sup>2</sup></span>
Rashi on Menachot
"Seven times a day" - tefillin on the head and on the arm, this is two, and four tzitzit, and a mezuzah, this is seven
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