Reference for Bava Batra 51:10

והא אנן תנן אחד גפנים ואחד כל אילן אמר ליה ה"מ אילן לאילן וגפנים לגפנים אבל אילן לגפנים בעינן טפי

IF THE ROOTS [OF ONE MAN'S TREE] SPREAD INTO HIS NEIGHBOUR'S FIELD, [THE LATTER] CAN CUT THEM AWAY TO A DEPTH OF THREE HANDBREADTHS SO THAT THEY SHOULD NOT IMPEDE THE PLOUGH. IF HE DIGS A PIT, DITCH, OR CAVE, HE CAN CUT RIGHT DOWN [TO ANY DEPTH]. AND THE WOOD BELONGS TO HIM.<span class="x" onmousemove="('comment',' The Gemara discusses which one is meant. ');">⁹</span>

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