سنن النسائي

It was narrated from Mu'adh bin 'Abdullah bin Khubaib that his father said: "I was with the Messenger of Allah (ﷺ) [SAW] on the road to Makkah when I found myself alone with the Messenger of Allah (ﷺ) [SAW]. I drew close to him and he said: 'Say.' I said: 'What should I say?' He said: 'Say.' I said: 'What should I say?' He said: 'Say: I seek refuge with (Allah) the Lord of the daybreak...' until he finished (the Surah), then he said: 'Say: I seek refuge with (Allah) the Lord of mankind...' until he finished it. Then he said: 'The people cannot seek refuge with Allah by means of anything better than these two.'"