It wasnarrated from Hudhaifah bin Al-Yaman that he heard theMessenger ofAllah (ﷺ) say when he bowed:
"Subhana Rabbiyal-'Azim(Glory isto my Lord, the Most Great)" three times, and when heprostrated hesaid: "Subhana Rabbiyal-A'la (Glory is to my Lord theMost High)"three times. (DE)
English reference (DE): Vol. 1, Book 5, Hadith 888 (DE)
Arabic reference (DE): Book 5, Hadith 938 (DE)