Sayyiduna Hudhayfah (may Allah be pleased with him) narrates that I prayed one night with the Prophet (peace and blessings of Allah be upon him), and his bowing (ruku‘) was as long as his standing (qiyam). In his bowing, he used to recite this tasbih «‏‏‏‏سُبْحَانَ رَبِّي الْعَظِيمِ» ‏‏‏‏ "My Lord, the Most Great, is free from imperfection." Janab Salm narrated from A‘mash with ‘an. The Imam narrated from his esteemed teacher Janab Abu Musa and from the chain of Ya‘qub bin Ibrahim, from A‘mash, that I prayed one night with the Prophet (peace and blessings of Allah be upon him), and in his bowing he used to recite «‏‏‏‏سُبْحَانَ رَبِّي الْعَظِيمِ» ‏‏‏‏.