It is narrated from Sayyiduna Abu Shurayh al-Khuza'i (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever believes in Allah and the Last Day, let him speak good or remain silent; whoever believes in Allah and the Last Day, let him not harm his neighbour; whoever believes in Allah and the Last Day, let him honour his guest, (giving) his special hospitality." It was asked: What is his special hospitality? He (peace and blessings be upon him) said: "One day and one night."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18697