Tricks
Bukhari :: Book 9 :: Volume 86 :: Hadith 110
Narrated 'Amr bin Ash-Sharid:
Abu Rafi' sold a house to Sa'd bin Malik for four-hundred Mithqal of gold, and said, "If I had not heard the Prophet saying, 'The neighbor has more right to be taken care of by his neighbor (than anyone else),' then I would not have sold it to you."