Mu`adh bin `Abdullah bin Khubaib, narrated from his father, who said: “We went out on a rainy and extremely dark night, looking for the Messenger of Allah (ﷺ), so that he could lead us in Salat.” He said: “So I met him and he (ﷺ) said: ‘Speak’ but I did not say anything. Then he (ﷺ) said: ‘Speak.’ But I did not say anything. He (ﷺ) said: ‘Speak.’ So I said: ‘What should I say?’ He (ﷺ) said: ‘Say: “Say: He is Allah, the One” and Al-Mu`awwidhatain, when you reach evening, and when you reach morning, three times, they will suffice you against everything.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا مُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ أَبِي فُدَيْكٍ، حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ، عَنْ أَبِي سَعِيدٍ الْبَرَّادِ، عَنْ مُعَاذِ بْنِ عَبْدِ اللَّهِ بْنِ خُبَيْبٍ، عَنْ أَبِيهِ، قَالَ خَرَجْنَا فِي لَيْلَةٍ مَطِيرَةٍ وَظُلْمَةٍ شَدِيدَةٍ نَطْلُبُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُصَلِّي لَنَا - قَالَ - فَأَدْرَكْتُهُ فَقَالَ " قُلْ " . فَلَمْ أَقُلْ شَيْئًا ثُمَّ قَالَ " قُلْ " . فَلَمْ أَقُلْ شَيْئًا . قَالَ " قُلْ " . قُلْتُ مَا أَقُولُ قَالَ " قُلْ : ( هوَ اللَّهُ أَحَدٌ ) وَالْمُعَوِّذَتَيْنِ حِينَ تُمْسِي وَتُصْبِحُ ثَلاَثَ مَرَّاتٍ تَكْفِيكَ مِنْ كُلِّ شَيْءٍ " . قَالَ أَبُو عِيسَى وَهَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ وَأَبُو سَعِيدٍ الْبَرَّادُ هُوَ أَسِيدُ بْنُ أَبِي أَسِيدٍ مَدَنِيٌّ .
sunnah.com