C19 · Sunan Abu Dawud - General Behavior (Kitab Al-Adab), Hadith 5082 (Grade: Hasan - Good, Al-Albani)

Narrated Abdullah ibn Khubayb: We went out one rainy and intensely dark night to look for the Messenger of Allah (ﷺ) to lead us in prayer, and when we found him, he asked: Have you prayed?, but I did not say anything. So he said: Say, but I did not say anything. He again said: Say, but I did not say anything. He then said: Say. So I said: What am I to say? He said: Say: "Say, He is Allah, One," and al-Mu'awwadhatan three times in the morning and evening; they will serve you for every purpose.

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