Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that a sheep belonging to Sayyidah Maymunah (may Allah be pleased with her) died, so the Prophet (peace and blessings be upon him) said: "Why did you not make use of it?" The people said: It is carrion. He (peace and blessings be upon him) said: "Tanning the hide is its purification."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11363