Reference for Bava Batra 206:6
<big><strong>גמ׳</strong></big> איבעיא להו בית כור סתמא מאי תא שמע בית כור עפר אני מוכר לך מדה בחבל
AND IN A GARDEN, AN AREA OF HALF A <i>KAB</i><span class="x" onmousemove="('comment',' Which is regarded as a self-contained garden. v. supran 21a. ');"><sup>21</sup></span> AND, ACCORDING TO R. AKIBA, A QUARTER OF A <i>KAB</i>;<span class="x" onmousemove="('comment',' Which is regarded as a self-contained garden. v. supran 21a. ');"><sup>21</sup></span> THE LAND [ITSELF] IS TO BE RETURNED. NOT ONLY THE QUARTER<span class="x" onmousemove="('comment',' Of a kab per se'ah. ');"><sup>22</sup></span> IS TO BE RETURNED BUT ALL THE SURPLUS. <b><i>GEMARA</i></b>. The question was raised: What [if the seller] only [said, 'I sell you] a <i>beth kor</i>'?<span class="x" onmousemove="('comment',' Without specifying, either 'measured by the rope' or 'more or less'. ');"><sup>23</sup></span> — Come and hear! [IF A MAN SAYS TO ANOTHER.] 'I SELL YOU A BETH <i>KOR</i> OF ARABLE LAND, MEASURED BY THE ROPE',