Reference for Menachot 87:17

וכל שאין לו ציצית בבגדו עובר בחמשה עשה

but if he has not [both, the absence of one will certainly] invalidate the other. They asked him, 'Do you still say this? ' 'No', he replied; 'for can it be said that one wh has not the wherewithal to perform two precepts should not even perform one? ' What was his opinion before? - It was only a precaution lest he become negligent [in the precept].<span class="x" onmousemove="('comment',' And he will acquire only one tefillah since the use of one is itself a precept.');">¹⁰</span>

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