Sunan an-Nasa'i, Volume 5, Book 41, Hadith 4248 (DarusSalam) ⓘ

It was narrated from Salamah bin Al-Muhabbaq that: during the campaign of Tabuk, the Prophet of Allah called for water from a woman. She said: "I only have a waterskin of mine made from a dead animal." He said: "Didn't you tan it?" She said: "Of course." He said: "Tanning it purifies it." (Daif)

أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ جَوْنِ بْنِ قَتَادَةَ، عَنْ سَلَمَةَ بْنِ الْمُحَبِّقِ، أَنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم فِي غَزْوَةِ تَبُوكَ دَعَا بِمَاءٍ مِنْ عِنْدِ امْرَأَةٍ قَالَتْ مَا عِنْدِي إِلاَّ فِي قِرْبَةٍ لِي مَيْتَةٍ ‏.‏ قَالَ ‏"‏ أَلَيْسَ قَدْ دَبَغْتِهَا ‏"‏ ‏.‏ قَالَتْ بَلَى ‏.‏ قَالَ ‏"‏ فَإِنَّ دِبَاغَهَا ذَكَاتُهَا ‏"‏ ‏.‏