When shaytaan whispers doubts in the mind

Recite any of the following Duaas:

أَعُوْذُ بِاللَّهِ مِنَ الشَّيْطَانِ الرَّحِيمِ
I seek the protection of Allah from the accursed shaytan. (Bukhari, Muslim)

لَا إِلَهَ إِلَّا اللهُ
There is no deity except Allah. (Ahmad)

آمَنْتُ بِاللَّهِ وَ رُسُلِهِ
I believe in Allah and His Messengers. (Ahmad, Tabarani, Ibn Hibban)

هُوَ الْأَوَّلُ وَالْآخِرُ وَالظَّاهِرُ وَالْبَاطِنُ وَهُوَ بِكُلِّ شَيْءٍ عَلِيمٌ 
He is the First, the Last, the Apparent, the Hidden and He has knowledge of everything.


Reference: 

  • (Abu Dawud-statement of Ibn Abbas Radiyallahu anhuma)