Musannaf Ibn Abi Shayba 23:48

Yahya ibn Adam narrated to us, from Sufyan, from Asim, who said: We said to Talq ibn Habib, "Describe piety (taqwa) to us." He said: "Piety is acting in obedience to Allah, hoping for the mercy of Allah, upon a light from Allah. And piety is abandoning disobedience to Allah, fearing the punishment of Allah, upon a light from Allah."