Musannaf Ibn Abi Shayba 3:1067

Shababa narrated to us, he said: Layth ibn Sa'd narrated to us, from Yazid ibn Abi Habib, from 'Arak, from Nawfal ibn Mu'awiyah ibn 'Urwah, he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "It is the 'Asr prayer."