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Shiavault - a Vault of Shia Islamic Books A Commentary on Prayer Bowing Down {ruku‘} and Prostration {sujud} Bowing down {ruku‘} Bowing down { ruku‘ } is an essential pillar of prayer. Performing it in an excessive or inadequate manner, whether intentional or unintentional, renders the prayer invalid. The word “ rak‘ah ” {circle} which is used in counting the cycles of prayer is derived from the word “ ruku‘ ”.
When the verse, “So celebrate the Name of your Lord, the All-supreme,” [^2] was revealed, the Prophet (S) ordered: “Show reverence to God while you are in ruku‘ and recite this dhikr {remembrance or glorification}: سُبْحانَ رَبِّيَ ٱلْعَظيمِ وَ بِحَمدهِ Subhana rabbiya’l-‘azim wa bihamdih. “Glory be to my Lord, the Great, and praise belongs to Him.”[^3] We read in the traditions: “ Ruku‘ is the sign of courtesy { adab } while the sujud is the symbol of nearness { qurb } to God.
Imam as-Sadiq ( ‘a ) says: “Long ruku‘ and sujud makes Iblis angry, saying, ‘Woe to me! With such quality of servitude, the people will no longer obey me.”[^7] God says to the angels: “See my servants, how they express reverence to Me and they kneel down in front of Me.