Sayyiduna Mu`aaz Ibn `Abdullaah ibn Khubaib رضى الله تعالى عنه narrated from his father رضى الله تعالى عنه who said: The Messenger of Allah (peace be upon him) instructed him to recite: (1) Surah Ikhlaas (2) Surah Falaq (3) Surah Naas every morning and evening thrice, as they will suffice you against everything. (This was part of a lengthy narration) (Tirmizi)