كتاب الإيمان
1  
The Book of Faith
(19)
Chapter: Encouragement to honor one's neighbor and guest, and the obligation to remain silent unless one has something good to say, and the fact that all of that is part of faith
(19)
باب الْحَثِّ عَلَى إِكْرَامِ الْجَارِ وَالضَّيْفِ وَلُزُومِ الصَّمْتِ إِلاَّ مِنَ الْخَيْرِ وَكَوْنِ ذَلِكَ كُلِّهِ مِنَ الإِيمَانِ
Sahih Muslim 47 c

Another hadith similar to one narrated (above) by Abu Husain is also reported by Abu Huraira with the exception of these words:

He (the Prophet) said: He should do good to the neighbour.
وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا عِيسَى بْنُ يُونُسَ، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِمِثْلِ حَدِيثِ أَبِي حَصِينٍ غَيْرَ أَنَّهُ قَالَ ‏ "‏ فَلْيُحْسِنْ إِلَى جَارِهِ ‏"‏ ‏.‏
Reference : Sahih Muslim 47c
In-book reference : Book 1, Hadith 82
USC-MSA web (English) reference : Book 1, Hadith 77
  (deprecated numbering scheme)