• رَاكِع
• ٱرْكَعُوا۟
• ٱرْكَعِى
• يَرْكَعُونَ

Appears 10 times in the Quran.

1. 2:43 وَأَقِيمُوا۟ ٱلصَّلَوٰةَ وَءَاتُوا۟ ٱلزَّكَوٰةَ وَٱرْكَعُوا۟ مَعَ ٱلرَّٰكِعِينَ

   And keep up prayer and pay the poor-rate and bow down with those who bow down.
   

2. 2:125 وَإِذْ جَعَلْنَا ٱلْبَيْتَ مَثَابَةً لِّلنَّاسِ وَأَمْنًا وَٱتَّخِذُوا۟ مِن مَّقَامِ إِبْرَٰهِۦمَ مُصَلًّى وَعَهِدْنَآ إِلَىٰٓ إِبْرَٰهِۦمَ وَإِسْمَٰعِيلَ أَن طَهِّرَا بَيْتِىَ لِلطَّآئِفِينَ وَٱلْعَٰكِفِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ

   And when We made the House a pilgrimage for men and a (place of) security, and: Appoint for yourselves a place of prayer on the standing-place of Ibrahim. And We enjoined Ibrahim and Ismail saying: Purify My House for those who visit (it) and those who abide (in it) for devotion and those who bow down (and) those who prostrate themselves.
   

3. 3:43 يَٰمَرْيَمُ ٱقْنُتِى لِرَبِّكِ وَٱسْجُدِى وَٱرْكَعِى مَعَ ٱلرَّٰكِعِينَ

   O Marium! keep to obedience to your Lord and humble yourself, and bow down with those who bow.
   

4. 5:55 إِنَّمَا وَلِيُّكُمُ ٱللَّهُ وَرَسُولُهُۥ وَٱلَّذِينَ ءَامَنُوا۟ ٱلَّذِينَ يُقِيمُونَ ٱلصَّلَوٰةَ وَيُؤْتُونَ ٱلزَّكَوٰةَ وَهُمْ رَٰكِعُونَ

   Only Allah is your Vali and His Messenger and those who believe, those who keep up prayers and pay the poor-rate while they bow.
   

5. 9:112 ٱلتَّٰٓئِبُونَ ٱلْعَٰبِدُونَ ٱلْحَٰمِدُونَ ٱلسَّٰٓئِحُونَ ٱلرَّٰكِعُونَ ٱلسَّٰجِدُونَ ٱلْءَامِرُونَ بِٱلْمَعْرُوفِ وَٱلنَّاهُونَ عَنِ ٱلْمُنكَرِ وَٱلْحَٰفِظُونَ لِحُدُودِ ٱللَّهِ وَبَشِّرِ ٱلْمُؤْمِنِينَ

   They who turn (to Allah), who serve (Him), who praise (Him), who fast, who bow down, who prostrate themselves, who enjoin what is good and forbid what is evil, and who keep the limits of Allah; and give good news to the believers.
   

6. 22:26 وَإِذْ بَوَّأْنَا لِإِبْرَٰهِيمَ مَكَانَ ٱلْبَيْتِ أَن لَّا تُشْرِكْ بِى شَيْـًٔا وَطَهِّرْ بَيْتِىَ لِلطَّآئِفِينَ وَٱلْقَآئِمِينَ وَٱلرُّكَّعِ ٱلسُّجُودِ

   And when We assigned to Ibrahim the place of the House, saying: Do not associate with Me aught, and purify My House for those who make the circuit and stand to pray and bow and prostrate themselves.
   

7. 22:77 يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ ٱرْكَعُوا۟ وَٱسْجُدُوا۟ وَٱعْبُدُوا۟ رَبَّكُمْ وَٱفْعَلُوا۟ ٱلْخَيْرَ لَعَلَّكُمْ تُفْلِحُونَ

   O you who believe! bow down and prostrate yourselves and serve your Lord, and do good that you may succeed.
   

8. 38:24 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

   He said: Surely he has been unjust to you in demanding your ewe (to add) to his own ewes; and most surely most of the partners act wrongfully towards one another, save those who believe and do good, and very few are they; and Dawood was sure that We had tried him, so he sought the protection of his Lord and he fell down bowing and turned time after time (to Him).
   

9. 48:29 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

   Muhammad is the Messenger of Allah, and those with him are firm of heart against the unbelievers, compassionate among themselves; you will see them bowing down, prostrating themselves, seeking grace from Allah and pleasure; their marks are in their faces because of the effect of prostration; that is their description in the Taurat and their description in the Injeel; like as seed-produce that puts forth its sprout, then strengthens it, so it becomes stout and stands firmly on its stem, delighting the sowers that He may enrage the unbelievers on account of them; Allah has promised those among them who believe and do good, forgiveness and a great reward.
   

10. 77:48 وَإِذَا قِيلَ لَهُمُ ٱرْكَعُوا۟ لَا يَرْكَعُونَ

    And where it is said to them: Bow down, they do not bow down.