Reference for Bava Batra 155:4
<big><strong>גמ׳</strong></big> אמר עולא מחלוקת בשק ודיסקיא וכומני דתנא קמא סבר סתם חמור לרכוב קאי ונחום המדי סבר סתם חמור למשאוי קאי אבל אוכף ומרדעת קילקלי וחבק ד"ה מכורין
<b><i>MISHNAH</i></b>. HE WHO SELLS AN ASS HAS NOT SOLD ITS EQUIPMENT.<span class="x" onmousemove="('comment',' The Gemara explains the reason. ');"><sup>12</sup></span> NAHUM THE MEDE SAYS: HE HAS SOLD ITS EQUIPMENT.<span class="x" onmousemove="('comment',' As it is, i.e., with its equipment. ');"><sup>13</sup></span> R. JUDAH SAYS: SOMETIMES IT IS SOLD, SOMETIMES IT IS NOT SOLD. HOW SO? IF THE ASS WITH ITS EQUIPMENT UPON IT STOOD BEFORE HIM AND HE [THE BUYER] SAID UNTO HIM: 'SELL ME THIS ASS<span class="x" onmousemove="('comment',' As it is, i.e., with its equipment. ');"><sup>13</sup></span> OF YOURS, THEN ITS EQUIPMENT IS SOLD. [IF, HOWEVER, HE SAID]: 'IS THE ASS YOURS? [SELL IT TO ME].'<span class="x" onmousemove="('comment',' In this case he offered to buy the ass only. ');"><sup>14</sup></span>