(19) باب الْحَثِّ عَلَى إِكْرَامِ الْجَارِ وَالضَّيْفِ وَلُزُومِ الصَّمْتِ إِلاَّ مِنَ الْخَيْرِ وَكَوْنِ ذَلِكَ كُلِّهِ مِنَ الإِيمَانِ
It is reported on the authority of Abu Huraira that the Messenger of Allah (may peace and blessings be upon him) observed:
He who believes in Allah and the Last Day does not harm is neighbour, and he who believes in Allah and the Last Day shows hospitality to his guest and he who believes in Allah and the Last Day speaks good or remains silent.
Reference: Sahih Muslim 47 b
In-book reference: Book 1, Hadith 81
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 76