Abu Dawud
Wages
Book Number: 017 / Hadith Number: 3552
Narated By Zayd ibn Thabit : The Prophet (pbuh) said: If anyone gives something in life-tenancy, it belongs to the one to whom it is given, in his life and after his death; and do not give property to go to the survivor, for if anyone gives something to the survivor, it belongs to him.