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Rukūʿ (Arabic: رُكوع) refers to a paragraph of the holy book Qur'an. There are 558 or in some books there are 540 Rukus in Holy Quran. In prayer it refers to the bowing down from the standing position while praying according to Islamic ritual (salat). There is a consensus on the obligatory nature of the rukūʿ. The position of rukūʿ is established by bending over, putting one's hands on one's knees, and remaining in that position until the individual attains "calmness".
- Bowing (rukūʿ) and prostration (sujud) are accompanied by a renewed affirmation of the supreme greatness of Allah. In bowing you renew your submissiveness and humility, striving to refine your inner feeling through a fresh awareness of your own impotence and insignificance before the might and grandeur of your Lord. To confirm this, you seek the aid of your tongue, glorifying your Lord and testifying repeatedly to His supreme majesty, both inwardly and outwardly.
- Then you rise from bowing, hopeful that He will be merciful towards you. To emphasise this hope within you, you say samiʾa -llāhu liman ḥamidahu (سمع الله لمن حمده), meaning 'God hears those who give thanks to Him'. Acknowledging the need to express gratitude, you immediately add, rabbana lak al-ḥamd (ربّنا لك الحمد) - 'Grateful praise to You, our Lord!' To show the abundance of this gratitude, you may also say malʾ as-samāwāt wa-malʾ al-ʾarḍ (ملء السماوات وملء الأرض) - 'as much as the heavens and earth contain'.
The term rukūʿ — roughly translated to "passage", "pericope" or "stanza" — is also used to denote a group of thematically related verses in the Qur'an. Longer suras (chapters) in the Qur'an are usually divided into several rukūʿs, so that the reciters could identify when to make rukūʿ in Salat without breaking an ongoing topic in the Quranic text.