It is narrated from Sayyiduna Salamah bin al-Muhabbiq (may Allah be pleased with him) that the Prophet of Allah (peace and blessings be upon him), during the Battle of Tabuk, asked a woman for water. She said: I have nothing but water in a waterskin made from a dead animal. He (peace and blessings be upon him) said: "Have you not tanned it?" She said: Yes. He (peace and blessings be upon him) said: "Its slaughter is its tanning."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6313