Sahih Muslim Book 1, Hadith Number 77.

Chapter : Concerning exhortation to accord honour and respect to the neighbour and the guest and obligation to observe silence except in goodness, and all these qualities come within the orbit of Iman.

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.