Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever believes in Allah and His Messenger, let him pay the zakah on his wealth; whoever believes in Allah and His Messenger, let him speak good or remain silent; and whoever believes in Allah and His Messenger, let him honour his guest."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13504