Sura al-Baqara 2:143

وَكَذَٰلِكَ جَعَلْنَٰكُمْ أُمَّةً وَسَطًا لِّتَكُونُوا۟ شُهَدَآءَ عَلَى ٱلنَّاسِ وَيَكُونَ ٱلرَّسُولُ عَلَيْكُمْ شَهِيدًا وَمَا جَعَلْنَا ٱلْقِبْلَةَ ٱلَّتِى كُنتَ عَلَيْهَآ إِلَّا لِنَعْلَمَ مَن يَتَّبِعُ ٱلرَّسُولَ مِمَّن يَنقَلِبُ عَلَىٰ عَقِبَيْهِ وَإِن كَانَتْ لَكَبِيرَةً إِلَّا عَلَى ٱلَّذِينَ هَدَى ٱللَّـهُ وَمَا كَانَ ٱللَّـهُ لِيُضِيعَ إِيمَٰنَكُمْ إِنَّ ٱللَّـهَ بِٱلنَّاسِ لَرَءُوفٌ رَّحِيمٌ

wa-ka-dhālika jaʿalnākum ummatan wasaṭan li-takūnū shuhadāʾa ʿalā l-nāsi wa-yakūna l-rasūlu ʿalaykum shahīdan wa-mā jaʿalnā l-qiblata allatī kunta ʿalayhā illā linaʿlama man yattabiʿu l-rasūla mimman yanqalibu ʿalā ʿaqibayhi wa-in kānat la-kabīratan illā ʿalā lladhīna hadā allāhu wa-mā kāna allāhu li-yuḍīʿa īmānakum inna allāha bil-nāsi la-raʾūfun raḥīmun

Thus, have We made of you an Ummat justly balanced, that ye might be witnesses over the nations, and the Messenger a witness over yourselves; and We appointed the Qibla to which thou wast used, only to test those who followed the Messenger from those who would turn on their heels (From the Faith). Indeed it was (A change) momentous, except to those guided by Allah. And never would Allah Make your faith of no effect. For Allah is to all people Most surely full of kindness, Most Merciful.

Sura Āl-ʿImrān 3:144

وَمَا مُحَمَّدٌ إِلَّا رَسُولٌ قَدْ خَلَتْ مِن قَبْلِهِ ٱلرُّسُلُ أَفَإِي۟ن مَّاتَ أَوْ قُتِلَ ٱنقَلَبْتُمْ عَلَىٰٓ أَعْقَٰبِكُمْ وَمَن يَنقَلِبْ عَلَىٰ عَقِبَيْهِ فَلَن يَضُرَّ ٱللَّـهَ شَيْـًٔا وَسَيَجْزِى ٱللَّـهُ ٱلشَّٰكِرِينَ

wa-mā muḥammadun illā rasūlun qad khalat min qablihi l-rusulu a-fa-īn māta aw qutila inqalabtum ʿala aʿqābikum wa-man yanqalib ʿalā ʿaqibayhi fa-lan yaḍurra allāha shayʾan wasayajzī allāhu l-shākirīna

Muhammad is no more than a messenger: many Were the messenger that passed away before him. If he died or were slain, will ye then Turn back on your heels? If any did turn back on his heels, not the least harm will he do to Allah; but Allah (on the other hand) will swiftly reward those who (serve Him) with gratitude.

Sura Āl-ʿImrān 3:149

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِن تُطِيعُوا۟ ٱلَّذِينَ كَفَرُوا۟ يَرُدُّوكُمْ عَلَىٰٓ أَعْقَٰبِكُمْ فَتَنقَلِبُوا۟ خَٰسِرِينَ

yā-ayyuhā lladhīna āmanū in tuṭīʿū lladhīna kafarū yaruddūkum ʿala aʿqābikum fa-tanqalibū khāsirīna

O ye who believe! If ye obey the Unbelievers, they will drive you back on your heels, and ye will turn back (from Faith) to your own loss.

Sura al-Anʿām 6:71

قُلْ أَنَدْعُوا۟ مِن دُونِ ٱللَّـهِ مَا لَا يَنفَعُنَا وَلَا يَضُرُّنَا وَنُرَدُّ عَلَىٰٓ أَعْقَابِنَا بَعْدَ إِذْ هَدَىٰنَا ٱللَّـهُ كَٱلَّذِى ٱسْتَهْوَتْهُ ٱلشَّيَٰطِينُ فِى ٱلْأَرْضِ حَيْرَانَ لَهُۥٓ أَصْحَٰبٌ يَدْعُونَهُۥٓ إِلَى ٱلْهُدَى ٱئْتِنَا قُلْ إِنَّ هُدَى ٱللَّـهِ هُوَ ٱلْهُدَىٰ وَأُمِرْنَا لِنُسْلِمَ لِرَبِّ ٱلْعَٰلَمِينَ

qul anadʿū min dūni allāhi mā lā yanfaʿunā wa-lā yaḍurrunā wa-nuraddu ʿala aʿqābinā baʿda idh hadanā allāhu ka-lladhī istahwathu l-shayāṭīnu fī l-arḍi ḥayrāna lahu aṣḥābun yadʿūnahu ilā al-huda iʾtinā qul inna huda allāhi huwa l-hudā wa-umirnā linuslima li-rabbi l-ʿālamīna

Say: "Shall we indeed call on others besides Allah,- things that can do us neither good nor harm,- and turn on our heels after receiving guidance from Allah? - like one whom the evil ones have made into a fool, wandering bewildered through the earth, his friends calling, come to us', (vainly) guiding him to the path." Say: "Allah's guidance is the (only) guidance, and we have been directed to submit ourselves to the Lord of the worlds;-

Sura al-Anfāl 8:48

وَإِذْ زَيَّنَ لَهُمُ ٱلشَّيْطَٰنُ أَعْمَٰلَهُمْ وَقَالَ لَا غَالِبَ لَكُمُ ٱلْيَوْمَ مِنَ ٱلنَّاسِ وَإِنِّى جَارٌ لَّكُمْ فَلَمَّا تَرَآءَتِ ٱلْفِئَتَانِ نَكَصَ عَلَىٰ عَقِبَيْهِ وَقَالَ إِنِّى بَرِىٓءٌ مِّنكُمْ إِنِّىٓ أَرَىٰ مَا لَا تَرَوْنَ إِنِّىٓ أَخَافُ ٱللَّـهَ وَٱللَّـهُ شَدِيدُ ٱلْعِقَابِ

wa-idh zayyana lahumu l-shayṭānu aʿmālahum wa-qāla lā ghāliba lakumu l-yawma mina l-nāsi wa-innī jārun la-kum fa-lammā tarāʾati l-fiʾatāni nakaṣa ʿalā ʿaqibayhi wa-qāla innī barīʾun minkum innī ara mā lā tarawna innī akhāfu allāha wallāhu shadīdu l-ʿiqābi

Remember Satan made their (sinful) acts seem alluring to them, and said: "No one among men can overcome you this day, while I am near to you": But when the two forces came in sight of each other, he turned on his heels, and said: "Lo! I am clear of you; lo! I see what ye see not; Lo! I fear Allah: for Allah is strict in punishment."

Sura al-Muʾminūn 23:66

قَدْ كَانَتْ ءَايَٰتِى تُتْلَىٰ عَلَيْكُمْ فَكُنتُمْ عَلَىٰٓ أَعْقَٰبِكُمْ تَنكِصُونَ

qad kānat āyātī tutlā ʿalaykum fakuntum ʿala aʿqābikum tankiṣūna

"My Signs used to be rehearsed to you, but ye used to turn back on your heels-

Sura al-Zukhruf 43:28

وَجَعَلَهَا كَلِمَةًۢ بَاقِيَةً فِى عَقِبِهِۦ لَعَلَّهُمْ يَرْجِعُونَ

wa-jaʿalahā kalimatan bāqiyatan fī ʿaqibihi la-ʿallahum yarjiʿūna

And he left it as a Word to endure among those who came after him, that they may turn back (to Allah).