Sayyiduna Zaid bin Thabit (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings of Allah be upon him): "Tanning the skin of a dead animal makes it pure."
Hadith Referenceسنن الدارقطني / كتاب الطهارة / 122
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 122»