آمَنْتُ بِاللهِ وَرُسُلِهِ
Translation 
If one gets afflicted by doubts, with regards to his or her faith (imaan) or the laws of Allah then;
He should renounce that which is causing such doubt.
And He should say:
“I have believed in Allah and His Messengers.”
He should renounce that which is causing such doubt.
And He should say:
“I have believed in Allah and His Messengers.”
Transliteration
aamantu billaahi wa rusulih
Sources:
Muslim No# 134
