Reference for Bava Batra 156:7
רבי יהודה אומר פעמים מכורין וכו': מאי שנא חמורך זו ומאי שנא חמורך הוא
and the reason, therefore, why he said unto him, 'THIS',<span class="x" onmousemove="('comment',' Heb. [H], implies the ass as it stands, viz., with all its equipment. ');"><sup>18</sup></span> [must have been] on account of its equipment. [But when he asked], 'IS THE ASS YOURS?' [he did so] because he was not aware that the ass was his, and this was [the implication of] his inquiry: 'is the ass yours? Sell it to me.'<span class="x" onmousemove="('comment',' Here, no emphasis was laid on 'this ass' (cf. previous note). The equipment therefore is excluded from the sale. ');"><sup>19</sup></span> <b><i>MISHNAH</i></b>. HE WHO SOLD AN ASS HAS [ALSO] SOLD<span class="x" onmousemove="('comment',' Throughout this Mishnah 'also sold' means, 'sold implicitly at the same time'. ');"><sup>20</sup></span>