Musnad Ahmad 33:63

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from 'Ata' ibn Abi Rabah, from Jabir ibn Abdullah, from the Prophet, may Allah bless him and grant him peace, that he said: "The 'Umra (gift of a house for life) is permissible."