Sahih Bukhari Volume 8, Book 73, Hadith Number 160.

Narated By Abu Huraira : The Prophet said, “Whoever believes in Allah and the Last Day, should serve his guest generously; and whoever believes in Allah and the Last Day, should unite the bond of kinship (i.e. keep good relation with his Kith and kin); and whoever believes in Allah and the Last Day, should talk what is good or keep quit.”