Sahih Muslim Book 012, Hadith Number 3975.
Chapter : Al-'Umra (Life grant).
Jabir (Allah be pleased with him) said: The Umra for which Allah's Messenger (may peace be upon him) gave sanction that a person way say: This (property) is for you and for your descendants. And when he said: That is for you as long as you live, then it will return to its owner (after the death of the donee). Ma'mar said: Zuhri used to give religious verdict according to this.