Reciting Three Quls

One should recite the three Quls (i.e. Surah Ikhlaas, Surah Falaq and Surah Naas) thrice every morning and evening.

عن عبد الله بن خبيب رضي الله عنه قال: خرجنا في ليلة مطيرة وظلمة شديدة نطلب رسول الله صلى الله عليه و سلم يصلي لنا قال فأدركته فقال قل فلم أقل شيئا ثم قال قل فلم أقل شيئا قال قل قلت ما أقول؟ قال قل هو الله أحد والمعوذتين حين تمسي وتصبح ثلاث مرات تكفيك من كل شيء (ترمذي رقم 3575)

Hadhrat Abdullah ibn Khubaib (Radhiallahu Anhu) reports that on one occasion during a rainy night we set out in search for Rasulullah (Sallallahu Alaihi Wasallam) so that he may lead us in salaah. It was an intensely dark night. I then met Rasulullah (Sallallahu Alaihi Wasallam) and he told me, “Recite.” But (not knowing what to recite) I did not recite anything. He told me for the second time, “Recite.” But (not knowing what to recite) I did not recite anything. He told me for the third time, “Recite.” I then asked, “What should I recite, O Rasulullah (Sallallahu Alaihi Wasallam)?” Rasulullah (Sallallahu Alaihi Wasallam) replied, “Recite Surah Ikhlaas and Muawwazatain (i.e. Surah Falaq and Surah Naas) in the morning and evening thrice, it will suffice you as a protection from all harm.