Musannaf Ibn Abi Shayba 16:547

Abu Bakr narrated to us, he said: Khalid narrated to us, from Malik ibn Anas, from Yazid ibn Qusayt, from Muhammad ibn Abd al-Rahman, from his mother, from Aisha, who said: The Messenger of Allah (may Allah bless him and grant him peace) commanded that the skins of dead animals be utilized when they have been tanned.