In times of great distress, Ibn `Abbas narrates that the Messenger of Allah (Allah bless him and grant him peace) used to say:

لاَ إِلَهَ إِلاَّ اللهُ العَظِيمُ الْحَلِيمُ، لاَ إِلَهَ إِلاَّ اللهُ رَبُّ العَرشِ العَظِيم، لاَ إِلَهَ إِلاَّ اللهُ رَبُّ السَّمَاوَات وَرَبُّ الأَرْض، وَرَبُّ العَرشِ الكَرِيم

La ilaha ill-Allah ul-`Azimul-Halim, la ilaha ill-Allahu rabbu’l`arshi-l’`azim, la ilaha ill-Allahu rabbu`ssamawati wa rabbu’l-ardi wa rabbu’l`arshi-l-karim

“There is no god but Allah, the Great, the Forbearing, there is no god but Allah, the Lord of the mighty throne, there is no god but Allah the Lord of the heavens and the earth and the noble throne.”