Hadith 8252

وَقَال : " الْعَجْمَاءُ جَرْحُهَا جُبَارٌ ، وَالْبِئْرُ جُبَارٌ ، وَالْمَعْدِنُ جُبَارٌ ، وَفِي الرِّكَازِ الْخُمُسُ " .
And the Messenger of Allah, peace and blessings be upon him, said: The wound caused by a beast 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 buried treasure that someone finds, one fifth (khums) is obligatory.
Hadith Reference مسند احمد / مسند المكثرين من الصحابة / 8252
Hadith Grading حکم دارالسلام: إسناده صحيح، خ: 2355، م: 1710