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Narrated Ibn 'Abbas: The Prophet used to say at the time of difficulty, 'La ilaha il-lallah Al-'Alimul-Halim. La-ilaha il-lallah 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)