Surat Al-Kahf (The Cave) - الكهف

إِنَّهُمْ إِن يَظْهَرُوا۟ عَلَيْكُمْ يَرْجُمُوكُمْ أَوْ يُعِيدُوكُمْ فِى مِلَّتِهِمْ وَلَن تُفْلِحُوٓا۟ إِذًا أَبَدًا ﴿٢٠﴾

For surely if they prevail against you they would stone you to death or force you back to their religion, and then you will never succeed.