حِصْنُ الْمُسْلِمِ
Hisn al-Muslim 41
Fortress of the Muslim (Hisn al-Muslim)
While prostrating
سُبْـحانَ رَبِّـيَ الأَعْلـى. (ثلاث مرات)
Subḥāna Rabbiya ‘l-a`lā. Glory is to my Lord, the Most High. (This is said three times in Arabic.) Reference: Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmidhi, and Ahmad. See also Al-Albani, Sahih At-Tirmidhi 1/83.
Hisn al-Muslim, 41