حَسْبِيَ اللَّهُ لَا إِلَهَ إِلَّا هُوَ عَلَيْهِ تَوَكَّلْتُ وَهُوَ رَبُّ الْعَرْشِ الْعَظِيمِ
Transliteration
Hasbiyallahu la ilaha illa huwa 'alayhi tawakkaltu wa huwa Rabbul-'arshil-'azim
English meaning
Allah is sufficient for me. There is no deity except Him. Upon Him I have relied, and He is the Lord of the Mighty Throne.
When is it recited?
In times of distress, recite 7 times.
Its virtue
Whoever recites this 7 times morning and evening, Allah will suffice him in this world and the next.
Source
At-Tawbah 9/129