Sura al-Kahf 18:20

إِنَّهُمْ إِن يَظْهَرُوا۟ عَلَيْكُمْ يَرْجُمُوكُمْ أَوْ يُعِيدُوكُمْ فِى مِلَّتِهِمْ وَلَن تُفْلِحُوٓا۟ إِذًا أَبَدًا

innahum in yaẓharū ʿalaykum yarjumūkum aw yuʿīdūkum fī millatihim wa-lan tufliḥū idhan abadan

"For if they should come upon you, they would stone you or force you to return to their cult, and in that case ye would never attain prosperity."