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.
أَنَّ رَسُولَ اللَّهِ ﷺ فِي غَزْوَةِ تَبُوكَ أَتَى عَلَى بَيْتٍ فَإِذَا قِرْبَةٌ مُعَلَّقَةٌ فَسَأَلَ الْمَاءَ فَقَالُوا يَا رَسُولَ اللَّهِ إِنَّهَا مَيْتَةٌ فَقَالَ دِبَاغُهَا طُهُورُهَا