It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The blood of one who is killed by an animal is wasted, the blood of one who dies by falling into a well is wasted, the blood of one who dies in a mine is also wasted, and in the case of buried treasure (found by someone), one-fifth (khums) is obligatory.