Musnad Abu Ya'la al-Mawsili 108:84

Zuhayr narrated to us, Hushaym narrated to us, Dawud ibn Abi Hind informed us, from Abu al-Zubayr, from Jabir, that the Messenger of Allah (may Allah bless him and grant him peace) said: "The *'umra* (gift of a house for life) is permissible for those to whom it is given."