Musannaf Ibn Abi Shayba 3:1667

4044. Abdullah ibn al-Mubarak and Isa ibn Yunus narrated to us, from al-Awza’i, from Uthman ibn Abi Sawda, from Khulayd, from Abu al-Darda, who said: "I would not mind if I prayed upon six carpets, one on top of the other."