[Machine] The Prophet of Allah ﷺ went out on one of his military campaigns and passed by the people of Abiyat from the Arab tribes. He sent a message to them asking if they had any water for the Prophet of Allah ﷺ to perform ablution with. They replied, "We only have water in a vessel that we have used to tan the skin of a dead animal with milk." He sent them a message saying, "Indeed, its tanning has made it pure." So he received the water and performed ablution with it, then he prayed.  

أَنَّ رَسُولَ اللهِ ﷺ خَرَجَ فِي بَعْضِ مَغَازِيهِ فَمَرَّ بِأَهْلِ أَبْيَاتٍ مِنَ الْعَرَبِ فَأَرْسَلَ إِلَيْهِمْ هَلْ مِنْ مَاءٍ لِوُضُوءِ رَسُولِ اللهِ ﷺ؟ فَقَالُوا مَا عِنْدَنَا مَاءٌ إِلَّا فِي إِهَابِ مَيْتَةٍ دَبَغْنَاهُ بِلَبَنٍ فَأَرْسَلَ إِلَيْهِمْ «إِنَّ دِبَاغَهُ طَهُورُهُ» فَأُتِيَ مِنْهُ فَتَوَضَّأَ ثُمَّ صَلَّى