Reference for Bava Batra 153:4

ורב חייא בר אבין אמר רב הונא שלשה שטרות הן תרי הא דאמרן אידך אם קדם מוכר וכתב את השטר

[If, however, he says, 'take possession of the field] on condition that you write for him the deed', he may withdraw<span class="x" onmousemove="('comment',' Because in this case he intimated his desire that the field shall become the property of the donee only after he had received the deed; and since the deed has not been delivered, both the field and the deed may be withdrawn at the discretion of the donor. ');">¹⁰</span> both the deed and the field. But R. Hiyya b. Abin says in the name of R. Huna: There are three kinds of deeds. Two have just been described. [And the] third<span class="x" onmousemove="('comment',' Lit., 'another'. ');">¹¹</span> is one which the seller writes before [the sale],<span class="x" onmousemove="('comment',' Being anxious to sell, and in order to expedite the transaction on obtaining the consent of the buyer, he requests a scribe to prepare the deed before he knows whether the person to whom he wishes to sell would consent to buy. ');">¹²</span>

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