The Messenger of Allah [SAW] said to him: "O Ibn 'Abis, shall I not tell you of the best thing with which those who seek refuge with Allah may do so?" He said: "Yes, O Messenger of Allah." He said: "Say: I seek refuge with (Allah) the Lord of the daybreak.", "Say: I seek refuge with (Allah) the Lord of mankind." - these two Surahs." (Using translation from Nasāʾī 5432)   

قَالَ رَسُولُ اللهِ ﷺ يَا ابْنَ عَابِسٍ أَلَا أُخْبِرُكَ بِأَفْضَلِ مَا تَعَوَّذَ َمِنْهُ الْمُتَعَوِّذُونَ؟ قُلْتُ بَلَى يَا رَسُولَ اللهِ قَالَ قُلْ أَعُوذُ بِرَبِّ الْفَلَقِ وَقُلْ أَعُوذُ بِرَبِّ النَّاسِ