From Sahih Bukhari (Hadith 6345):
Narrated Ibn `Abbas:The Prophet (ﷺ) used to invoke Allah at the time of distress, saying, "La ilaha illal-lahu Al-`Azim, al- Halim, La ilaha illal-lahu Rabbu-s-samawati wal-ard wa Rabbu-l-arsh il-azim
Reference: Bukhari 6345