It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The wound caused by an animal is without liability, the blood of one who dies by falling into a well is without liability, the blood of one who dies in a mine is also without liability, and for the buried treasure (found by someone), one-fifth (khums) is obligatory.