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, none has the right to be worshipped except Him, upon Him I rely and He is Lord of the Exalted Throne.
When is it recited?
Recited 7 times in the morning and evening.
Its virtue
Whoever says this 7 times, Allah will suffice them in all their affairs of this world and the next.
Source
Abu Dawud, Witr 24, 5081; At-Tawbah 9:129