Invocation
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While bowing in prayer
سُبْـحانَ رَبِّـيَ الْعَظـيم (ثلاث مرات)
Glory to my Lord the Exalted (three times in Arabic)
Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmidhi, and Ahmad. See Al-Albani's
Sahih At-Tirmidhi 1/83.