Commentary for Eruvin 49:18

מ"ט בעידנא דשדא לא קא שבח כי קא שבחא ממילא קא משבחא

One holds that this is effective and the other maintains that it is ineffective.<span class="x" onmousemove="('comment',' A mound has the status of a partition; and it is the view of the former that one partition on the top of another is valid while the other maintains that it is invalid.');">²⁵</span> You may conclude that it was R'Hisda who held that [the partition] is effective; for it was stated: If one partition was put up upon another, it is, R'H ruled, effective as regards [the laws of] the Sabbath but no possession of the property of a proselyte<span class="x" onmousemove="('comment',' Who died, leaving no Jewish heirs, and whose estate may accordingly be seized by any member of the public.');">²⁶</span>

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