Reference for Eruvin 190:20

ורבן גמליאל סבר שבת לאו זמן תפילין הוא

of R'Samuel son of R'Isaac<span class="x" onmousemove="('comment',' Hence he allows only one pair at a time.');">³⁷</span> while R'Gamaliel<span class="x" onmousemove="('comment',' Who allows two pairs.');">³⁸</span> upholds it?

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