Reference for Eruvin 190:2

רבי שמעון אומר נותנן לחבירו וחבירו לחבירו עד שמגיע לחצר החיצונה

PASS THEM TO HIS FELLOW AND HIS FELLOW SHALL PASS THEM TO HIS FELLOW, AND SO ON,<span class="x" onmousemove="('comment',' Each person carrying the tefillin a lesser distance than four cubits.');">²</span> UNTIL THE OUTERMOST COURTYARD<span class="x" onmousemove="('comment',' Of the nearest town; sc. a place of safety.');">³</span> IS REACHED.

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