Reference for Bava Batra 153:2

ולא והאמר רבה בר יצחק אמר רב שני שטרות הם זכו בשדה לפלוני וכתבו לו את השטר חוזר בשטר ואינו חוזר בשדה

are words, and words cannot be acquired by means of [other] words.<span class="x" onmousemove="('comment',' I.e., a deed of sale. ');">⁴</span> And [can they] not? Surely Raba b. Isaac said in the name of Rab: There are two [kinds] of deeds. [If a person says],<span class="x" onmousemove="('comment',' I.e., to witnesses. ');">⁵</span> 'take possession<span class="x" onmousemove="('comment',' Possession of the field on behalf of a donee is obtained by the handing over of an object (e.g. a scarf) by the donor to witnesses. The transfer of the object symbolises the transfer of the gift. ');">⁶</span>

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