7הִקְנָה אֶחָד כְּלִי לַמּוֹכֵר כְּדֵי שֶׁיִּקְנֶה הַלּוֹקֵחַ אוֹתוֹ הַמִּמְכָּר זָכָה הַלּוֹקֵחַ. וְאַף עַל פִּי שֶׁהִקְנָה לוֹ הַכְּלִי עַל מְנָת לְהַחְזִירוֹ נִקְנָה הַמִּקָּח וְזָכָה בּוֹ הַלּוֹקֵחַ. שֶׁהַמַּתָּנָה עַל מְנָת לְהַחְזִיר שְׁמָהּ מַתָּנָה. אַף עַל פִּי שֶׁלֹּא תָּפַס הַמּוֹכֵר כָּל הַכְּלִי שֶׁהִקְנָהוּ חֵלֶף מִמְכָּרוֹ אֶלָּא אָחַז מִקְצָתוֹ וְאָחַז הַמַּקְנֶה לוֹ מִקְצָתוֹ קָנָה הַלּוֹקֵחַ. וְהוּא שֶׁאָחַז מִמֶּנּוּ כְּדֵי שִׁעוּר כְּלִי אוֹ יֹאחֲזֶנּוּ אֲחִיזָה שֶׁהוּא יָכוֹל לְנַתֵּק אֶת כָּל הַכְּלִי מִיַּד הַמַּקְנֶה לוֹ. לְפִיכָךְ אִם הִקְנָה לוֹ בְּמִקְצָת הַבֶּגֶד צָרִיךְ שֶׁיֶּאֱחֹז מִן הַבֶּגֶד שָׁלֹשׁ אֶצְבָּעוֹת. שֶׁאִם יִפְסֹק מִמָּקוֹם שֶׁאָחַז הֲרֵי הוּא כְּלִי בִּפְנֵי עַצְמוֹ. שֶׁשָּׁלֹשׁ אֶצְבָּעוֹת מִבֶּגֶד קָרוּי כְּלִי כְּמוֹ שֶׁבֵּאַרְנוּ בְּעִנְיַן טֻמְאַת בְּגָדִים. וְכֵן אִם אָחַז פָּחוֹת מִשָּׁלֹשׁ וְהָיָה יָכוֹל לְנַתֵּק כָּל הַכְּלִי קָנָה:
When a third party transfers a utensil to the seller so that the purchaser will acquire merchandise that was designated, the purchaser acquires it. Even though he transfers the utensil to him with the intent that it be returned, the transaction is binding, and the purchaser acquires the merchandise intended. For a gift that is given with the stipulation that it be returned is nevertheless considered a gift. Moreover, even if the seller does not take hold of the entire utensil that was transferred to him in exchange for his merchandise, but rather holds a portion of it, and the person transferring the utensil to him holds the other portion, the purchaser acquires the merchandise, provided [the seller] holds a portion of the utensil that can itself be considered to be a utensil, or grabs it in a manner in which he would be able to pull the entire utensil from the hands of the person transferring it into his own possession. Therefore, if the person transferred a portion of a garment to a seller, the seller must hold a portion of the garment the size of three fingerbreadths. Thus, if he cuts off the portion that he is holding, it would be considered a utensil in its own right. For a portion of a garment the size of three fingerbreadths is considered a garment, as has been explained with regard to the subject of the ritual impurity of garments. Similarly, if the seller holds on to a portion smaller than three fingerbreadths but could pull the entire garment into his possession, the purchaser acquires the merchandise being sold.