Reference for Yoma 66:4

חד שדייה להטבת חמש נרות דליקדמי לדם התמיד דהכא תלתא והכא תרי

Said Raba: From what Resh Lakish said we infer that it is forbidden to forego the arm in favour of the forehead.<span class="x" onmousemove="('comment',' To reverse the order of putting on the tefillin (v. Glos.) . hrucg');">⁶</span> How shall he do it?

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