It is narrated from Sayyiduna Abdullah bin Ukaym (may Allah be pleased with him): A letter of the Messenger of Allah (peace and blessings be upon him) was read out to us, and it said: "Do not benefit from the skin of a dead animal, nor from its sinews."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 41