Anas bin Malik said: “Whenever a matter would distress him, the Prophet (peace be upon him) would say: ‘O Living, O Self-Sustaining Sustainer! In Your Mercy do I seek relief (Yā Ḥayyu yā Qayyūm, bi-raḥmatika astaghīth).’” And with this chain, that he said: “The Messenger of Allah (peace be upon him) said: ‘Be constant with: “O Possessor of Majesty and Honor (Yā Dhal-Jalāli wal-Ikrām).’”
(Jami` at-Tirmidhi, Vol. 6, Book 48, Hadith 155)