The Book of Legal Punishments
حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحِ بْنِ الْمُهَاجِرِ، أَخْبَرَنَا اللَّيْثُ، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنِ الأَسْوَدِ، بْنِ الْعَلاَءِ عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ قَالَ " الْبِئْرُ جَرْحُهَا جُبَارٌ وَالْمَعْدِنُ جَرْحُهُ جُبَارٌ وَالْعَجْمَاءُ جَرْحُهَا جُبَارٌ وَفِي الرِّكَازِ الْخُمْسُ " .Abu Huraira reported Allah's Messenger (ﷺ) as saying:The wound caused (by falling) in the well, in the mine, and caused bv the animal has no requital for it; and there is one-fifth (for the government) in the buried treasure
From Sahih Muslim, whose reports the scholars accept as authentic.