Maliks Muwatta Book 36, Hadith Number 45.
Section : Judgement on Life Pensions.
Malik related to me from Nafi that Abdullah ibn Umar inherited the house of Hafsa bint Umar. He said, “Hafsa gave lodging to the daughter of Zayd ibn al-Khattab for as long as she lived. When the daughter of Zayd died, Abdullah ibn Umar took possession of the dwelling and considered that it was his.”