لَا إِلَٰهَ إِلَّا اللَّهُ الْعَظِيمُ الْحَلِيمُ، لَا إِلَٰهَ إِلَّا اللَّهُ رَبُّ الْعَرْشِ الْعَظِيمِ، لَا إِلَٰهَ إِلَّا اللَّهُ رَبُّ السَّمَاوَاتِ وَرَبُّ الْأَرْضِ وَرَبُّ الْعَرْشِ الْكَرِيمِ
La ilaha illallahul-Azimul-Halim, la ilaha illallahu Rabbul-Arshil-Azim, la ilaha illallahu Rabbus-samawati wa Rabbul-ardi wa Rabbul-Arshil-Karim
There is no deity but Allah, the Magnificent, the Forbearing. There is no deity but Allah, Lord of the Magnificent Throne. There is no deity but Allah, Lord of the heavens, Lord of the earth, and Lord of the Noble Throne.
Recite during times of severe distress or calamity
The Prophet (PBUH) used to say this dua at times of distress and calamity.