Musnad Ahmad 462:15

Haywah ibn Shurayh and Ahmad ibn Abd al-Malik narrated to us, they said: Baqiyyah narrated to us, Buhayr ibn Sa’d narrated to us, from Khalid ibn Ma’dan, from al-Miqdam ibn Ma’di Karib, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, forbade silk, gold, and the saddle cushions of leopards."