Surah al-Falaq
قُلْ أَعُوذُ بِرَبِّ الْفَلَقِ، مِنْ شَرِّ مَا خَلَقَ، وَمِنْ شَرِّ غَاسِقٍ إِذَا وَقَبَ، وَمِنْ شَرِّ النَّفَّاثَاتِ فِي الْعُقَدِ، وَمِنْ شَرِّ حَاسِدٍ إِذَا حَسَدَ
Qul a'udhu bi-rabbil-falaq. Min sharri ma khalaq. Wa min sharri ghasiqin idha waqab. Wa min sharrin-naffathati fil-'uqad. Wa min sharri hasidin idha hasad.
Say: I take refuge with the Lord of the daybreak, from the evil of what He has created, from the evil of darkness when it settles, from the evil of those who blow on knots, and from the evil of an envier when he envies.
What it means
This surah names the harms that arrive from outside you: the dark, magic, and the envious eye. The One you turn to is called the Lord of daybreak, the One who splits the night open every single morning, so the image itself is a promise that darkness does not get the last word.
When and how
Recite three times each morning and evening, after every prayer, and before sleep together with al-Ikhlas and an-Nas.
Its virtue
The Prophet ﷺ said no one has ever sought refuge with anything like these two final surahs, reported in Sahih Muslim 814. He used them as ruqyah for himself during his final illness, reported in Sahih al-Bukhari 5016.
Source
Quran 113
Quranic text from Tanzil.net, Creative Commons Attribution 3.0.