Musnad Abu Ya'la al-Mawsili 6:96

Ishaq ibn Abi Isra'il narrated to us, Sufyan narrated to us, from al-'Ala' ibn Abi al-'Abbas, from Abu al-Tufayl, from Bakr ibn Qirwash, from Sa'd, from the Prophet, may Allah bless him and grant him peace, and he mentioned Dhu al-Thudayyah. He said: "A devil of the ravine, whom a man from Bajilah—called al-Ashhab or the son of al-Ashhab—will bring down. A sign among a people of darkness."