I was with the Messenger of Allah ﷺ on the road to Mecca, and I found myself alone with him. I drew near, and he said, "Say."I asked, "What shall I say?"He said, "Say."I asked again, "What shall I say?"He said, "Say, 'I seek refuge in the Lord of daybreak'," and he recited it to its end. Then he said, "Say, 'I seek refuge in the Lord of mankind'," and he recited it to its end. Then he said, "People have never sought refuge with anything better than these two."
أخبرنا يونس بن عبد الأعلى قال حدثنا ابن وهب قال أخبرني حفص بن ميسرة عن زيد بن أسلم
كنت مع رسول الله ﷺ في طريق مكة فأصبت خلوة من رسول الله ﷺ فدنوت منه فقال قل فقلت ما أقول قال قل قلت ما أقول قال قل أعوذ برب الفلق حتى ختمها ثم قال قل أعوذ برب الناس حتى ختمها ثم قال ما تعوذ الناس بأفضل منهما
[Its chain of transmission is hasan] See the previous hadith, it is in Kubra, no. 7858.