Reference for Bava Batra 343:3

אמר להו רב לספריה וכן אמר להו רב הונא לספריה כי קיימיתו בשילי כתבו בשילי ואע"ג דמסירן לכו מילי בהיני כי קיימיתו בהיני כתבו בהיני ואף על גב דמסירן לכו מילי בשילי

the date of transfer<span class="x" onmousemove="('comment',' V. previous note. [In order to preclude the donor from presenting the gift to some one else.] In the case of a deed of sale, the buyer must be enabled, in addition, to seize such lands as wore sold during the period subsequent to the date of transfer. (Rashb.) ');">⁷</span> if you know it; and if not, enter the date on which the deed is prepared,<span class="x" onmousemove="('comment',' Lit., 'on which you stand'. ');">⁸</span> so that it<span class="x" onmousemove="('comment',' The entry of a date of which they were not certain. ');">⁹</span>

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