Reference for Eruvin 190:10

ואי קסבר שבת לאו זמן תפילין הוא ומשום הצלה דרך מלבוש שרו ליה רבנן אפילו טפי נמי

There,<span class="x" onmousemove="('comment',' Where a man is engaged in saving clothes from a fire.');">¹³</span> where on a weekday a man can wear as many clothes as he desires the Rabbis have permitted him to do so also<span class="x" onmousemove="('comment',' On the Sabbath.');">¹⁶</span> for the purpose of saving; but here,<span class="x" onmousemove="('comment',' The case of tefillin.');">¹⁵</span>

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