عَنْ عُثْمَانَ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ مَنْ قَالَ بِسْمِ اللَّهِ الَّذِي لَا يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الْأَرْضِ وَلَا فِي السَّمَاءِ وَهُوَ السَّمِيعُ الْعَلِيمُ ثَلَاثَ مَرَّاتٍ لَمْ تَفْجَأْهُ فَاجِئَةُ بَلَاءٍ حَتَّى اللَّيْلِ وَمَنْ قَالَهَا حِينَ يُمْسِي لَمْ تَفْجَأْهُ فَاجِئَةُ بَلَاءٍ حَتَّى يُصْبِحَ إِنْ شَاءَ اللَّهُ
It is narrated from Sayyiduna Uthman (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him and his family) said: Whoever recites this supplication: BISMILLAHILLADHI LA YADURRU MA’ASMHI SHAY’UN FIL ARDI WA LA FIS SAMA’I WAHUWAS SAMEE’UL ALEEM (“In the name of Allah, with whose name nothing in the earth or the sky can cause harm, and He is the All-Hearing, All-Knowing”), whoever recites this supplication three times in the morning, then, insha’Allah, no sudden calamity will befall him until night; and similarly, whoever does this in the evening, then, insha’Allah, no sudden calamity will befall him until morning.