Musannaf Ibn Abi Shayba 17:1081

Abu Bakr narrated to us, he said: Muhammad ibn Bishr narrated to us, he said: Isma'il narrated to us, he said: Qays ibn Abi Hazim narrated to me, from Mudrik ibn 'Awf, he said: I passed by Bilal while he was in al-Sham, sitting in the early morning. I said: "What keeps you, O Abu 'Abd Allah?" He said: "I am waiting for the rising of the sun."