Sahih Muslim , Book 6, Hadith 319 (In-Book) ⓘ

'Uqba b. 'Amir reported Allah's Messenger as saying: What wonderful verses have been sent down today. the like of which has never been seen! They are:" Say: I seek refuge with the Lord of the dawn," and" Say: I seek refuge with the Lord of men."

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ بَيَانٍ، عَنْ قَيْسِ بْنِ أَبِي حَازِمٍ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَلَمْ تَرَ آيَاتٍ أُنْزِلَتِ اللَّيْلَةَ لَمْ يُرَ مِثْلُهُنَّ قَطُّ ‏{‏ قُلْ أَعُوذُ بِرَبِّ الْفَلَقِ‏}‏ وَ ‏{‏ قُلْ أَعُوذُ بِرَبِّ النَّاسِ‏}‏ ‏"‏ ‏.‏