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.  

قُرِئَ عَلَيْنَا كِتَابُ رَسُولِ اللَّهِ ﷺ بِأَرْضِ جُهَيْنَةَ وَأَنَا غُلاَمٌ شَابٌّ أَنْ لاَ تَسْتَمْتِعُوا مِنَ الْمَيْتَةِ بِإِهَابٍ وَلاَ عَصَبٍ  

They entered and I sat at the door. Then they came out and told me that Abdullah ibn Ukaym had informed them that the Messenger of Allah ﷺ had written to Juhaynah one month before his death: Do not make use of the skin or sinew of an animal which died a natural death. Abu Dawud said: Al-Nadr b. Shumail said: The skin is called ihab when it is not tanned and when it is tanned, it not called ihab but na,es shann and qirbah (tanned skin or leather).  

الْحَكَمُ فَدَخَلُوا وَقَعَدْتُ عَلَى الْبَابِ فَخَرَجُوا إِلَىَّ فَأَخْبَرُونِي أَنَّ عَبْدَ اللَّهِ بْنَ عُكَيْمٍ أَخْبَرَهُمْ أَنَّ رَسُولَ اللَّهِ ﷺ كَتَبَ إِلَى جُهَيْنَةَ قَبْلَ مَوْتِهِ بِشَهْرٍ أَنْ لاَ يَنْتَفِعُوا مِنَ الْمَيْتَةِ بِإِهَابٍ وَلاَ عَصَبٍ