It is narrated from Sayyiduna Abu Shurayh al-Khuza'i (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever believes in Allah and the Last Day, let him honour his neighbour; whoever believes in Allah and the Last Day, let him honour his guest; and whoever believes in Allah and the Last Day, let him speak good or remain silent."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18701