"I was walking with the Messenger of Allah said: 'No one who asks has ever asked by means of anything like them, and no one who seeks refuge has ever sought refuge with anything like them.'"
Sunan an-Nasa'i Book 50, Hadith 11
← Previous Hadith "While I was leading the Messenger of Allah rode. Then he said: 'Shall I not teach you two of the best Surahs that the people recite?' And he taught me: 'Say: I seek refuge with (Allah) the Lord of the daybreak,' and 'Say: I seek refuge with (Allah) the Lord of mankind." Then the Iqamah was said and he went forward and recited them. Then he passed by me and said: 'What do you think, O 'Uqbah bin 'Amir? Recite them every time you go to sleep and get up.'"

Sunan an-Nasa'i Book 50, Hadith 10 Next Hadith → "I came to the Messenger of Allah while he was riding, and I put my hand on his foot and said: 'Teach me Surah Hud, teach me Surah Yusuf. He said: 'You will never recite anything more precious before Allah, the Mighty and Sublime, than: 'Say: I seek refuge with (Allah) the Lord of the daybreak.'"

Sunan an-Nasa'i Book 50, Hadith 12