Commentary for Kiddushin 51:8
מתיב רב המנונא בשטר כיצד כתב לו על הנייר או על החרס אע"פ. שאין בהם שוה פרוטה שדי מכורה לך שדי נתונה לך הרי זו מכורה ונתונה הוא מותיב לה והוא מפרק לה במוכר שדהו מפני רעתה
Samuel said: This was taught only of a deed of gift. But in the case of sale, no title is obtained until the money is paid.<span class="x" onmousemove="('comment',' Unless otherwise stipulated (Rashi) .');"><sup>14</sup></span> R'Hamnuna objected: By deed: E.g. , if he [the vendor] writes for him [the vendee] on paper or a shard,<span class="x" onmousemove="('comment',' Shards were used for this purpose in very ancient times: v. Krauss, T.A. 111, 147f, and n. 113a, 1.');"><sup>15</sup></span>
Daf Shevui to Kiddushin
R. Hamnuna cites a baraita which explains the mishnah. This baraita equates between selling and given—in both cases the transaction is valid even before money was given.
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Daf Shevui to Kiddushin
R. Hamnuna distinguishes between one who sells something because it is poor quality and one who sells something because he needs the cash. If he is selling it because it is poor quality, then he really wants to get rid of it, and the sale is valid as soon as the deed is signed. However, if he is selling for other reasons, he may retract until he receives the cash.
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