Reference for Eruvin 204:11
אמר רב יהודה אמר שמואל הלכה כר' יהודה אמר רב חסדא לא שנו אלא שפירשה על גבי כלי אבל פירשה על גבי קרקע דברי הכל אסור
on the Sabbath.<span class="x" onmousemove="('comment',' As such accidents do not frequently happen the Rabbis enacted no preventive measure against them.');"><sup>37</sup></span> R'Judah ruled: Only if it slipped downwards may it be pushed back upwards or if it slipped upwards it may be pushed back downwards.<span class="x" onmousemove="('comment',' But if it was completely detached it may not be replaced.');"><sup>38</sup></span> One may also uncover a part of the plaster and wipe the opening of the wound<span class="x" onmousemove="('comment',' On the exposed part.');"><sup>39</sup></span> and then another part of the plaster may be uncovered and the opening of the wound<span class="x" onmousemove="('comment',' On the exposed part.');"><sup>39</sup></span>