Sahih Muslim Book - 3, Hadith - 814

حَدَّثَنِي إِسْحَاقُ بْنُ مَنْصُورٍ وَأَبُو بَكْرِ بْنُ إِسْحَاقَ قَالَ أَبُو بَكْرٍ حَدَّثَنَا وَقَالَ ابْنُ مَنْصُورٍ أَخْبَرَنَا عَمْرُو بْنُ الرَّبِيعِ أَخْبَرَنَا يَحْيَى بْنُ أَيُّوبَ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ أَنَّ أَبَا الْخَيْرِ حَدَّثَهُ قَالَ رَأَيْتُ عَلَى ابْنِ وَعْلَةَ السَّبَإِيِّ فَرْوًا فَمَسِسْتُهُ فَقَالَ مَا لَكَ تَمَسُّهُ؟ قَدْ سَأَلْتُ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ قُلْتُ إِنَّا نَكُونُ بِالْمَغْرِبِ وَمَعَنَا الْبَرْبَرُ وَالْمَجُوسُ نُؤْتَى بِالْكَبْشِ قَدْ ذَبَحُوهُ وَنَحْنُ لَا نَأْكُلُ ذَبَائِحَهُمْ وَيَأْتُونَا بِالسِّقَاءِ يَجْعَلُونَ فِيهِ الْوَدَكَ فَقَالَ ابْنُ عَبَّاسٍ قَدْ سَأَلْنَا رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ ذَلِكَ فَقَالَ دِبَاغُهُ طَهُورُهُ.

Abu Al-Khair said: "I saw Ibn Wa'lah As-Saba'i wearing an animal pelt and I touched it. He said: 'Why did you touch it (do you think it is impure)? I asked 'Abdullah bin 'Abbas: 'We live in the west and with us there are Berbers and Zoroastrians who bring us a ram that they have slaughtered, and we do not eat of the meat they slaughter. And they bring us skins in which they put fat." Ibn 'Abbas said: 'We asked the Messenger of Allah (s.a.w) about that and he said: 'Its tanning is its purification."'