Reference for Bava Batra 304:3

היכי דמי מיפה את כחו אמר רב חסדא וקנינא מיניה מוסיף על מתנתא דא

[It is] obvious [that where a dying man] gave [all his estate] in writing to one man<span class="x" onmousemove="('comment',' Lit., 'this'. ');">⁹</span> and [subsequently] to another<span class="x" onmousemove="('comment',' Lit., 'and he wrote to this'. ');">¹⁰</span> the [law is the] very same as [that which] R. Dimi enunciated when he came, [vis., one] will annuls [another] will.<span class="x" onmousemove="('comment',' Supra 135b. Hence the second donee acquires the ownership of the gift. ');">¹¹</span> [If. however.] he wrote [a deed of the gift] and handed<span class="x" onmousemove="('comment',' Cf. p. 656. n. 6. ');">¹</span>

Jastrow