When a matter would worry the Prophet (ﷺ), he would raise his head up toward the sky and say: “Glory is to Allah, the Magnificent (Subḥān Allāhil-`Aẓīm).” And when he would strive in supplication; he would say: “O the Living, O Sustainer (Yā Ḥayyu yā Qayyūm).”

Jami` at-Tirmidhi Book 48, Hadith 67