#1015
سُبْـحانَ رَبِّـيَ الْعَظـيم (ثلاث مرات)
Transliteration
Subḥāna Rabbiyal-`Aẓīm.
Translation
Glory to my Lord the Exalted (three times in Arabic)
Dua #1015•Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmidhi, and Ahmad. See Al-Albani's Sahih At-Tirmidhi 1/83.
While bowing in prayer
Hisnul Muslim