Saying Subhan Rabbil A'la in prostration and saying Subhan Rabbil Azim in bowing

Question:
It is established from the Prophet (peace and blessings be upon him) the saying: (Subuhun Quddus Rabb al-Mala'ikah wa al-Ruh) [The All-Purifying, the Most Holy, Lord of the angels and the Spirit], in bowing and prostration. Is this sufficient in these two places, or is it necessary to say with it the well-known dhikr: (Subhan Rabbil A'la) and (Subhan Rabbil Azim)?

Answer:
The answer: It is necessary to do this. One must say (Subhan Rabbil Azim) in bowing, and say (Subhan Rabbil A'la) in prostration. One recitation is sufficient, the minimum of perfection is three times, and the maximum of perfection is ten times. If one adds to it: (Subuhun Quddus Rabb Rabb al-Mala'ikah wa al-Ruh), all of these are among the attributes of Allah (Glorified and Exalted is He). This is what completes the perfection, but (Subhan Rabbil Azim) in bowing and (Subhan Rabbil A'la) in prostration is obligatory; it is necessary in the prayer.