Musannaf Ibn Abi Shayba 21:155

Zayd ibn al-Hubab al-Ukli narrated to us, Abu Mawdud narrated to us, he said: Narrated to me one who heard Aban ibn Uthman, he said: Narrated to me my father, Uthman, that he heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "Whoever says, when he reaches the morning and when he reaches the evening, three times: 'In the name of Allah, with whose name nothing in the earth or in the heaven can cause harm, and He is the All-Hearing, the All-Knowing,' nothing will afflict him in his day nor in his night."