I asked 'Abdullah b. 'Abbas saying: We are the inhabitants of the western regions. The Magians come to us with skins full of water and fat. He said: Drink. I said to him: Is it your own opinion? Ibn Abbas said: I heard the Messenger of Allah (ﷺ) say: Tanning purifies it (the skin).
Reference: Sahih Muslim 366 d In-book : Book 3, Hadith 136 USC-MSA web (English) : Book 3, Hadith 713 (deprecated)
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