Narrated Ibn `Abbas: The Prophet used to say at the time of difficulty, 'La ilaha il-lallah Al-`Alimul-Halim. La-ilaha illallah Rabul- Arsh-al-Azim, La ilaha-il-lallah Rabus-Samawati Rab-ul-Ard; wa Rab-ul-Arsh Al- Karim.' (See Hadith No. 356 and 357, Vol. 8)