From the route of Ibn Mas^ud  may Allah accept his deeds who said: The Messenger of Allah,         
sallallahu ^alayhi wa sallam, said:" the one who says:

أستغفر الله الذى لا إله إلا هو الحي القيوم وأتوب إليه        

Astaghfiru-llaha al-ladhi la ilaha illa Huwa al-Hayya al-Qayyuma wa atubu ilayh.

which means: I seek the forgiveness of Allah the One Whom no one is God but Him, the Alive, the
One Who needs none and I repent to Him;
Will be forgiven for his sins even if he had escaped from the obligatory battle."

Al-Hakim said this Hadith is sahih as per the conditions of Al-Bukhariyy and Muslim.
The Forty Nawawi Hadith
Supplications reported from the Prophet to be said morning and evening
The Explanation of Hadith Jibril about Iman (Belief)
Supplications text for Protection
Supplications for Protection, Sound MP3
HADITH