Reference for Bava Metzia 209:7

והתנן מפני שמעלת לפני עשבים אלא משום דא"ל בזרא דנפל נפל:

he can answer, '[The parts of the] '<i>iska</i> are interdependent.'<span class="x" onmousemove="('comment',' 'You might profit on your half, and I lose on mine; but both halves are security for each other.' ');">⁷</span>

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