Musannaf Ibn Abi Shayba 3:884

Hussain bin Ali narrated to us, from Za'idah, from Abdul-Malik bin Umayr, who said: Al-Mughirah bin Shu'bah prayed the morning prayer. He prayed it in the darkness (at the beginning of its time) and then he delayed it until I said, "The sun has either risen or it has not." He prayed it somewhere between those two times. His mu'adhdhin was Ibn al-Tayyah, and he had no mu'adhdhin other than him.