Reference for Menachot 87:16
אמר רב ששת כל שאינו מניח תפילין עובר בשמונה עשה
THE [ABSENCE OF THE] HAND-TEFILLAH DOES NOT INVALIDATE THE HEAD-TEFILLAH. R'Hisda said, This was taught only when he has [both],<span class="x" onmousemove="('comment',' I.e., he possesses both tefillin; in that case the wearing of one is not dependent upon the other.');"><sup>9</sup></span>
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