What did Allah's Apostle (saw) say about taking care of one's neighbor?
      Narrated 'Amr bin Ash-Sharid:                     Abu Rafi' said that Sa'd offered him      four hundred Mithqal of gold for a house. Abu Rafi ' said, "If I had      not heard Allah's Apostle saying, 'A neighbor has more right to be      taken care of by his neighbor,' then I would not have given it to      you." Some people said, "If one has bought a portion of a house and      wants to cancel the right of preemption, he may give it as a present      to his little son and he will not be obliged to take an oath."