صَحِيحُ مُسْلِمٍ
Sahih Muslim 366 c
The Book of Menstruation
Hides of dead animals are purified by tanning
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 السَّبَئِيِّ فَرْوًا فَمَسِسْتُهُ فَقَالَ مَا لَكَ تَمَسُّهُ قَدْ سَأَلْتُ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ قُلْتُ إِنَّا نَكُونُ بِالْمَغْرِبِ وَمَعَنَا الْبَرْبَرُ وَالْمَجُوسُ نُؤْتَى بِالْكَبْشِ قَدْ ذَبَحُوهُ وَنَحْنُ لاَ نَأْكُلُ ذَبَائِحَهُمْ وَيَأْتُونَا بِالسِّقَاءِ يَجْعَلُونَ فِيهِ الْوَدَكَ . فَقَالَ ابْنُ عَبَّاسٍ قَدْ سَأَلْنَا رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ فَقَالَ دِبَاغُهُ طَهُورُهُ .
Abu al-Khair reported: I saw Ibn Wa'la al-Saba'i wear a fur. I touched it. He said: Why do you touch it? I asked Ibn 'Abbas saying: We are the inhabitants of the western regions, and there (live) with us Berbers and Magians. They bring with them rams and slaughter them, but we do not eat (the meat of the animals) slaughtered by them, and they come with skins full of fat. Upon this Ibn 'Abbas said: We asked the Messenger of Allah (ﷺ) about this and he said: Its tanning makes it pure.
Sahih Muslim, 366 cSahihصحيح