Reference for Bava Batra 305:3

ההיא מתנתא דהוה כתוב בה בחיים ובמות רב אמר הרי היא כמתנת שכיב מרע ושמואל אמר הרי היא כמתנת בריא

There was a certain [deed of] a gift<span class="x" onmousemove="('comment',' Of a dying man who presented all, or part of his estate, and 'symbolic acquisition' was entered on the deed. ');">⁶</span> in which there was entered,<span class="x" onmousemove="('comment',' Lit., 'written', ');">⁷</span> 'in life and in death'.<span class="x" onmousemove="('comment',' 'The gift is to belong to the donee', ');">⁸</span>

Jastrow