It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever believes in Allah and the Last Day, let him honour his guest; whoever believes in Allah and the Last Day, let him speak good or remain silent; and whoever believes in Allah and the Last Day, let him honour his neighbour."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13688