عَقِبكُمْ
Appears 3 times in the Quran.
(Root: عقب)
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3:144 وَمَا مُحَمَّدٌ إِلَّا رَسُولٌ قَدْ خَلَتْ مِن قَبْلِهِ ٱلرُّسُلُ أَفَإِي۟ن مَّاتَ أَوْ قُتِلَ ٱنقَلَبْتُمْ عَلَىٰٓ أَعْقَٰبِكُمْ وَمَن يَنقَلِبْ عَلَىٰ عَقِبَيْهِ فَلَن يَضُرَّ ٱللَّهَ شَيْـًٔا وَسَيَجْزِى ٱللَّهُ ٱلشَّٰكِرِينَ
And Muhammad is no more than a messenger; the messengers have already passed away before him; if then he dies or is killed will you turn back upon your heels? And whoever turns back upon his heels!s, he will by no means do harm to Allah in the least and Allah will reward the grateful.
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3:149 يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِن تُطِيعُوا۟ ٱلَّذِينَ كَفَرُوا۟ يَرُدُّوكُمْ عَلَىٰٓ أَعْقَٰبِكُمْ فَتَنقَلِبُوا۟ خَٰسِرِينَ
O you who believe! if you obey those who disbelieve they will turn you back upon your heels, so you will turn back losers.
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My communications were indeed recited to you, but you used to turn back on your heels,