Reference for Eruvin 193:10

איני והא תני רבה בר שמואל בתפילין בודק שלש של יד ושל ראש מאי לאו או שלש של יד או שלש של ראש לא שלש מהן של יד מהן של ראש

If he bought them from one man,<span class="x" onmousemove="('comment',' Who has himself made them or bought them from the maker.');">²³</span> why should he not examine either three of the hand or three of the head,<span class="x" onmousemove="('comment',' Instead of two of the one and one of the other.');">²⁴</span> and if he bought them from two or three persons, should not each one require examination?<span class="x" onmousemove="('comment',' Of course it should, since the validity of the goods of one seller is no proof of the validity of those of any other.');">²⁵</span>

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