Commentary for Kiddushin 51:5
אמר רב לא שנו אלא במקום שאין כותבין את השטר אבל במקום שכותבין את השטר לא קנה ואי פריש פריש
it is so. E.g. , when R'Idi B'Abin bought land he used to say: 'If I wish, I acquire it by money; if I wish, I acquire it by deed.' [Thus:] 'If I wish, I acquire it by money,' so that should you desire to retract [after I have paid], you cannot.'
Daf Shevui to Kiddushin
Rav limits the mishnah’s rule to a place where deeds are not normally written. But if deeds are normally written, then a deed must be written to acquire land.
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Daf Shevui to Kiddushin
The Talmud, based on a practice of R. Idi b. Abin, allows the purchaser to make a statement that allows him to retract but not the seller. Of course, the seller has to agree to this arrangement, but if he dies, the purchaser has a legal right to make it.
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