The letter of the Messenger of Allah (ﷺ) was read out to us in the territory of Juhaynah when I was a young boy: Do not make use of the skin or sinew of an animal which died a natural death.
Reference: Sunan Abi Dawud 4127 In-book : Book 34, Hadith 108 English translation : Book 33, Hadith 4115
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