daf bit: Bava Batra 146
The mishna teaches: if a dying man gave all his property, in writing,
to others, but kept some land for himself, his gift is valid -- it
stands even if he recovers. (The g'mara asks: how much is "some"?
Enough for his maintenance, according to Rav Yehudah in the name of
Rav.) If, however, he did not keep any land for himself, his gift is
invalid -- he would not have given everything away if he thought he
would live. (146b mishna, 149a g'mara)
