What is the authenticity of saying: "Subhan Rabbi Al-Arsh Al-Adheem (Glory be to my Lord, the Lord of the Magnificent Throne)" in rukoo (bowing), and what is the difference between it and: "Subhan Rabbi Al-Adheem (Glory be to my Lord, the Magnificent)"?

One should adhere to the remembrance (dhikr) reported from the Prophet, peace and blessings be upon him, for the bowing (ruku'), which is: "Subhana Rabbiyal-Azeem" (Glory be to my Lord, the Most Great). The Hanbali jurists have stipulated that no other wording suffices, whereas the majority of scholars hold the view that glorification is a Sunnah. Therefore, the prayer is valid [even if this specific dhikr is not recited]. Sheikh al-Islam is of the opinion that what is obligatory is the general act of glorification, so the prayer is valid with the aforementioned remembrance: "Subhana Rabbil-Arshil-Azeem" (Glory be to the Lord of the Magnificent Throne). However, it is preferable to adhere to the wording reported [from the Prophet].