Hadith 5:979
Khalid ibn Makhlad narrated to us, from Kathir ibn Abdullah al-Muzani, from his father, from his grandfather, from the Prophet (peace and blessings of Allah be upon him), who said: "Regarding the *rikaz* (buried treasure), there is one-fifth."
حدثنا خالد بن مخلد عن كثير بن عبد الله المزني عن أبيه عن جده عن النبي صلى الله عليه وسلم قال في الركاز الخمس