Reference for Bava Batra 48:6

ומנא תימרא דשאני בין זרעין לאילנות דתניא קרפף יותר מבית סאתים שהוקף לדירה

MUST BE KEPT AT A DISTANCE OF FIFTY CUBITS. IF THE TOWN WAS THERE FIRST, THE TREE IS CUT DOWN<span class="x" onmousemove="('comment',' Lit., 'He cuts it'. to be taken impersonally, and denoting the townsmen who have to pay the compensation. ');">⁶</span>

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