Sahih Bukhari | Volume 8 | Hadith Number 357

Narrated by Ibn 'Abbas

Allah's Apostle used to say at a time of distress, "La ilaha illal-lahu Rabbul-l-'arsh il- 'azim, La ilaha illallahu Rabbu-s-samawati wa Rabbu-l-ard, Rabbu-l-'arsh-il-Karim."