Sahih al-Bukhari 6981
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 (ﷺ) 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."
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ سُفْيَانَ، قَالَ حَدَّثَنِي إِبْرَاهِيمُ بْنُ مَيْسَرَةَ، عَنْ عَمْرِو بْنِ الشَّرِيدِ، أَنَّ أَبَا رَافِعٍ، سَاوَمَ سَعْدَ بْنَ مَالِكٍ بَيْتًا بِأَرْبَعِمِائَةِ مِثْقَالٍ وَقَالَ لَوْلاَ أَنِّي سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ‏
"‏ الْجَارُ أَحَقُّ بِصَقَبِهِ ‏"‏‏.‏ مَا أَعْطَيْتُكَ‏.‏