It is narrated from Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "If an animal harms someone, there is no compensation for it; if someone falls into a well and dies, there is no compensation for it; if a laborer dies while digging a mine, there is no compensation for it; and one-fifth will be taken from the (disbelievers') buried treasure."