“Once abu ‘Abd Allah (a.s.), was asked about al-Sukna ’ and al-‘Umra’ (permission to use a house for a certain period of time). He (the Imam) said, ‘If permission to use the house is given for his lifetime, then it must remain as the condition requires, if it is for his and the lifetime of those whom he leaves behind until they die, then they cannot sell it or inherit it, but they must return the house to its first owner.’”