Musannaf Ibn Abi Shayba 21:36

Muhammad ibn Bishr narrated to us, he said: Abd al-Aziz ibn Umar narrated to us, he said: Hilal, the freed slave of Umar ibn Abd al-Aziz, narrated to me, from Umar ibn Abd al-Aziz, from Abdullah ibn Ja'far, from his mother, Asma bint Umays, who said: "O Messenger of Allah, teach me words that I may say during distress: 'Allah, Allah is my Lord, I do not associate anything with Him.'"