On the expedition of Tabuk the Messenger of Allah (ﷺ) came to a household and, seeing a bucket hanging, asked for water. They said: Messenger of Allah, the animal died a natural death. He replied; Its tanning is its purification.
Reference: Sunan Abi Dawud 4125 In-book : Book 34, Hadith 106 English translation : Book 33, Hadith 4113
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