It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that the Prophet Muhammad (peace and blessings be upon him) used to recite «‏‏‏‏سُبْحَانَ رَبِّي الْعَظِيمِ» ‏‏‏‏ three times in his bowing (ruku‘) and «‏‏‏‏سُبْحَانَ رَبِّي الْأَعْلَى » three times in his prostration (sujud).

Sayyiduna Hudhayfah (may Allah be pleased with him) narrates that I prayed with the Messenger of Allah (peace and blessings be upon him), then he mentioned the rest of the hadith and said: Then when he (peace be upon him) performed prostration, he recited in his prostration «‏‏‏‏سُبْحَانَ رَبِّي الْأَعْلَى » "Glory is to my Lord, the Most High."

Uqbah bin Amir (may Allah be pleased with him) narrates that when this verse was revealed «‏‏‏‏سَبِّحِ اسْمَ رَبِّكَ الْأَعْلَى» ‏‏‏‏ [ سورة الأعلى ] "Glorify the name of your Lord, the Most High," the Prophet Muhammad (peace be upon him) said to us: "Recite it in your prostration." From the chain of Imam Sahib's teacher, Muhammad bin Isa, a narration similar to the above is reported, but in his narration, the words «‏‏‏‏لنا» ‏‏‏‏ "said to us" are not present.