Related for Bava Metzia 4:2

כֵּיצַד. מָשַׁךְ הֵימֶנּוּ פֵרוֹת וְלֹא נָתַן לוֹ מָעוֹת, אֵינוֹ יָכוֹל לַחֲזֹר בּוֹ. נָתַן לוֹ מָעוֹת וְלֹא מָשַׁךְ הֵימֶנּוּ פֵרוֹת, יָכוֹל לַחֲזֹר בּוֹ. אֲבָל אָמְרוּ, מִי שֶׁפָּרַע מֵאַנְשֵׁי דוֹר הַמַּבּוּל וּמִדּוֹר הַפַּלָּגָה, הוּא עָתִיד לְהִפָּרַע מִמִּי שֶׁאֵינוֹ עוֹמֵד בְּדִבּוּרוֹ. רַבִּי שִׁמְעוֹן אוֹמֵר, כָּל שֶׁהַכֶּסֶף בְּיָדוֹ, יָדוֹ עַל הָעֶלְיוֹנָה:

How so? If he (the buyer) pulled fruits from him and did not give money, he cannot back out. If he gave him money and did not pull fruits from him, he [i.e., each one] can back out. [This is an ordinance of the sages. For by Torah law money effects acquisition, as we find in respect to hekdesh (consecrated property): "And he shall give the money and it shall be his." (see Leviticus 27:19). And why did they say that pulling effects acquisition, but not money? A decree, lest the buyer leave his purchase in the house of the seller a long time, and a fire break out in the vicinity of the seller, and he fail to exert himself to rescue it. Therefore, it was placed in his (the seller's domain), to back out of the sale if he wishes. So that if it rises in value, it does so in his domain, and he may back out of the sale and gain thereby. It being considered his, he will exert himself to rescue it.] But they said: "He who exacted punishment of the men of the generation of the flood and the generation of the Tower of Babel — He is destined to exact punishment of him who does not keep his word." [Even though he may back out, (if he does so) he is cursed in beth-din and told: "He who exacted punishment of the generation of the flood, and the generation of the Tower of Babel, and the men of Sodom and Amorah, and of the Egyptians, who drowned in the sea — He is destined to exact punishment of him who does not keep his word," after which he (the seller) returns his money.] R. Shimon says: Whoever holds the money has the upper hand. [R. Shimon refers here to the words of the first tanna, viz.: "If he gave him money and did not pull fruits from him, he (either the seller or the buyer) can back out." R. Shimon comes to tell us that sometimes the one who holds the money (that is, the seller, who received the money) has the upper hand, and he can confirm the sale if he wishes, without the buyer being able to back out. As in an instance where the buyer's upper story is rented to the seller, in which instance, if the seller wishes that the sale be confirmed, the buyer cannot back out, even if he did not pull the money. For why did the rabbis say that pulling effects acquisition? A decree, lest the seller say to the buyer: "Your grain was burned in the upper story." But here, where the upper story belongs to the buyer, if a fire breaks out, he himself will exert himself and retrieve it. The halachah is not in accordance with R. Shimon. But even if the buyer's upper story is rented to the seller, so long as he did not pull it, both buyer and seller can back out.]

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