Is it better, in a short prostration, to say “Subhan Allah” three times, or to suffice with one “Subhan Allah” and dedicate the rest of the time to supplication? And is it permissible to say in bowing (ruku‘) “Subbooh Quddoos Rabb al-Malaa’ikati wa al-Rooh” instead of saying “Subhan Allah al-Adheem” three times? And is it permissible to supplicate while bowing?

Glorifying Allah (Tasbih) in bowing (ruku') and prostration (sujud) is considered obligatory by some scholars and a Sunnah by others. A single Tasbih is sufficient, though three is preferable. The minimum for perfect Tasbih is three times, based on the Hadith of Ibn Mas'ud: "When one of you bows, let him say three times: 'Subhan Rabbi al-Azeem (Glory be to my Lord, the Most Great),' and that is the minimum. And when he prostrates, let him say: 'Subhan Rabbi al-A'la (Glory be to my Lord, the Most High),' three times, and that is the minimum." If time permits, one should make Tasbih three times, then engage in remembrance (dhikr) and supplication (du'a). If time is short, it is better to limit it to Tasbih three times.