Recite Surah an-Nas (114) after every obligatory prayer. — After Prayer Adhkar
قُلْ أَعُوذُ بِرَبِّ النَّاسِ مَلِكِ النَّاسِ
Transliteration: Qul a'oodhu birabbin-naas...
Translation: Recite Surah an-Nas (114) after every obligatory prayer.
Reference: Abu Dawud, An-Nasa'i