(3) Purification
كتاب الطهارة
(9b) Chapter: The Cleansing of Impurities - Section 2
(8) باب تطهير النجاسات - الفصل الثاني
Mishkat al-Masabih 509 
‘A'isha said God’s messenger commanded that the skins of animals which had died a natural death should be made use of after they had been tanned. Malik and Abu Dawud transmitted it.
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَمَرَ أَنْ يُسْتَمْتَعَ بِجُلُودِ الْمَيْتَةِ إِذَا دُبِغَتْ. رَوَاهُ مَالِكٌ وَأَبُو دَاوُد
 حسن  (الألباني)حكم :
Reference : Mishkat al-Masabih 509
In-book reference : Book 3, Hadith 208