Reference for Bava Batra 170:8
ומדרישא בכליו דמוכר סיפא נמי בכליו דמוכר אימא סיפא ברשות לוקח כיון שקיבל עליו מוכר קנה לוקח ואי בכליו דמוכר אמאי קנה לוקח סיפא אתאן לכליו דלוקח
that if the purchase was] on the premises of the seller, [the buyer] does not acquire possession until he has lifted it or has removed it from the seller's premises. Does not this [apply to the case when the purchase was] in the buyer's vessel?<span class="x" onmousemove="('comment',' Which proves that the question. whether the buyer's vessel on the premises of the seller can serve as a means of acquiring possession, is to be answered in the negative. ');"><sup>19</sup></span> — No; in the seller's vessel. But now, since the first clause [deals with a case where the purchase is] in the seller's vessel, the final clause also [must deal with a purchase] in the seller's vessel, [how then can you] explain [this] final clause? [It reads:] [If the purchase was] on the premises of the buyer, he acquires possession as soon as the seller has consented [to the terms of the sale].<span class="x" onmousemove="('comment',' Supra loc. cit. ');"><sup>20</sup></span> Now, if [the purchase was, as you assert], in the seller's vessel, why does the buyer acquire possession? — The final clause deals with a case when the vessel belongs to the buyer. And how [do you arrive at such] a definite decision? — It is usual that at the seller's, the vessels of the seller are likely to be used; at the buyer's, the vessels of the buyer are likely to be used.
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