It was narrated from Mu'adh bin 'Abdullah that his father said: "It was raining and dark, and we were waiting for the Messenger of Allah [SAW] to lead us in prayer. Then the Messenger of Allah [SAW] came out to lead us in prayer and he said: “Say.' I said: “What should I say?' He said: “Say: He is Allah, (the) One and Al-Mu'awwadhatain in the evening and in the morning, three times, and that will suffice you against everything”””"
HasanHasanIsnaad HasanBook 50 · Hadith 1