The root ر ك ع (r-k-ʿ) in the Quran

وَأَقِيمُوا۟ ٱلصَّلَوٰةَ وَءَاتُوا۟ ٱلزَّكَوٰةَ وَٱرْكَعُوا۟ مَعَ ٱلرَّٰكِعِينَ ۝٤٣

And establish prayer and give zakāh and bow with those who bow [in worship and obedience].

وَإِذْ جَعَلْنَا ٱلْبَيْتَ مَثَابَةً لِّلنَّاسِ وَأَمْنًا وَٱتَّخِذُوا۟ مِن مَّقَامِ إِبْرَٰهِـۧمَ مُصَلًّى وَعَهِدْنَآ إِلَىٰٓ إِبْرَٰهِـۧمَ وَإِسْمَٰعِيلَ أَن طَهِّرَا بَيْتِىَ لِلطَّآئِفِينَ وَٱلْعَٰكِفِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ ۝١٢٥

And [mention] when We made the House [i.e., the Kaʿbah] a place of return for the people and [a place of] security. And take, [O believers], from the standing place of Abraham a place of prayer. And We charged Abraham and Ishmael, [saying], "Purify My House for those who perform ṭawāf and those who are staying [there] for worship and those who bow and prostrate [in prayer]."

يَٰمَرْيَمُ ٱقْنُتِى لِرَبِّكِ وَٱسْجُدِى وَٱرْكَعِى مَعَ ٱلرَّٰكِعِينَ ۝٤٣

O Mary, be devoutly obedient to your Lord and prostrate and bow with those who bow [in prayer]."

إِنَّمَا وَلِيُّكُمُ ٱللَّهُ وَرَسُولُهُۥ وَٱلَّذِينَ ءَامَنُوا۟ ٱلَّذِينَ يُقِيمُونَ ٱلصَّلَوٰةَ وَيُؤْتُونَ ٱلزَّكَوٰةَ وَهُمْ رَٰكِعُونَ ۝٥٥

Your ally is none but Allāh and [therefore] His Messenger and those who have believed - those who establish prayer and give zakāh, and they bow [in worship].

ٱلتَّٰٓئِبُونَ ٱلْعَٰبِدُونَ ٱلْحَٰمِدُونَ ٱلسَّٰٓئِحُونَ ٱلرَّٰكِعُونَ ٱلسَّٰجِدُونَ ٱلْـَٔامِرُونَ بِٱلْمَعْرُوفِ وَٱلنَّاهُونَ عَنِ ٱلْمُنكَرِ وَٱلْحَٰفِظُونَ لِحُدُودِ ٱللَّهِ وَبَشِّرِ ٱلْمُؤْمِنِينَ ۝١١٢

[Such believers are] the repentant, the worshippers, the praisers [of Allāh], the travelers [for His cause], those who bow and prostrate [in prayer], those who enjoin what is right and forbid what is wrong, and those who observe the limits [set by] Allāh. And give good tidings to the believers.

وَإِذْ بَوَّأْنَا لِإِبْرَٰهِيمَ مَكَانَ ٱلْبَيْتِ أَن لَّا تُشْرِكْ بِى شَيْـًٔا وَطَهِّرْ بَيْتِىَ لِلطَّآئِفِينَ وَٱلْقَآئِمِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ ۝٢٦

And [mention, O Muḥammad], when We designated for Abraham the site of the House, [saying], "Do not associate anything with Me and purify My House for those who perform ṭawāf and those who stand [in prayer] and those who bow and prostrate.

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ ٱرْكَعُوا۟ وَٱسْجُدُوا۟ وَٱعْبُدُوا۟ رَبَّكُمْ وَٱفْعَلُوا۟ ٱلْخَيْرَ لَعَلَّكُمْ تُفْلِحُونَ ۝٧٧

O you who have believed, bow and prostrate and worship your Lord and do good - that you may succeed.

قَالَ لَقَدْ ظَلَمَكَ بِسُؤَالِ نَعْجَتِكَ إِلَىٰ نِعَاجِهِۦ وَإِنَّ كَثِيرًا مِّنَ ٱلْخُلَطَآءِ لَيَبْغِى بَعْضُهُمْ عَلَىٰ بَعْضٍ إِلَّا ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ وَقَلِيلٌ مَّا هُمْ وَظَنَّ دَاوُۥدُ أَنَّمَا فَتَنَّٰهُ فَٱسْتَغْفَرَ رَبَّهُۥ وَخَرَّ رَاكِعًا وَأَنَابَ ۝٢٤

[David] said, "He has certainly wronged you in demanding your ewe [in addition] to his ewes. And indeed, many associates oppress one another, except for those who believe and do righteous deeds - and few are they." And David became certain that We had tried him, and he asked forgiveness of his Lord and fell down bowing [in prostration] and turned in repentance [to Allāh].

مُّحَمَّدٌ رَّسُولُ ٱللَّهِ وَٱلَّذِينَ مَعَهُۥٓ أَشِدَّآءُ عَلَى ٱلْكُفَّارِ رُحَمَآءُ بَيْنَهُمْ تَرَىٰهُمْ رُكَّعًا سُجَّدًا يَبْتَغُونَ فَضْلًا مِّنَ ٱللَّهِ وَرِضْوَٰنًا سِيمَاهُمْ فِى وُجُوهِهِم مِّنْ أَثَرِ ٱلسُّجُودِ ذَٰلِكَ مَثَلُهُمْ فِى ٱلتَّوْرَىٰةِ وَمَثَلُهُمْ فِى ٱلْإِنجِيلِ كَزَرْعٍ أَخْرَجَ شَطْـَٔهُۥ فَـَٔازَرَهُۥ فَٱسْتَغْلَظَ فَٱسْتَوَىٰ عَلَىٰ سُوقِهِۦ يُعْجِبُ ٱلزُّرَّاعَ لِيَغِيظَ بِهِمُ ٱلْكُفَّارَ وَعَدَ ٱللَّهُ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ مِنْهُم مَّغْفِرَةً وَأَجْرًا عَظِيمًۢا ۝٢٩

Muḥammad is the Messenger of Allāh; and those with him are forceful against the disbelievers, merciful among themselves. You see them bowing and prostrating [in prayer], seeking bounty from Allāh and [His] pleasure. Their sign is in their faces from the effect of prostration [i.e., prayer]. That is their description in the Torah. And their description in the Gospel is as a plant which produces its offshoots and strengthens them so they grow firm and stand upon their stalks, delighting the sowers - so that He [i.e., Allāh] may enrage by them the disbelievers. Allāh has promised those who believe and do righteous deeds among them forgiveness and a great reward.

وَإِذَا قِيلَ لَهُمُ ٱرْكَعُوا۟ لَا يَرْكَعُونَ ۝٤٨

And when it is said to them, "Bow [in prayer]," they do not bow.