Subhaana Rabbiyal-A’laa (سُبْحَانَ رَبِّيَ الأَعْلَى) – Dr. Saleh as Saleh [Short Clip|Eng]
While prostrating (Sujood):
سُبْحَانَ رَبِّيَ الأَعْلَى
Glory is to my Lord, the Most High. (Recite three times in Arabic)
Abu Dawud, Ibn Majah, An-Nasa’i, At-Tirmithi, and Ahmad.
See also Al-Albani, Sahih At-Tirmithi 1/83.
Related Link: Dua during Sujud for worldly matters – Shaykh Abdil-‘Azeez Aali Shaikh