Musnad Abu Ya'la al-Mawsili 245:16

'Abd al-A'la ibn Hammad al-Narsi narrated to us, Hammad narrated to us, 'Abd Allah ibn Muhammad ibn 'Aqil narrated to us, from Muhammad ibn 'Ali ibn al-Hanafiyyah, from Mu'awiyah ibn Abi Sufyan, 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."