إِنَّهُمْ إِن يَظْهَرُوا عَلَيْكُمْ يَرْجُمُوكُمْ أَوْ يُعِيدُوكُمْ فِى مِلَّتِهِمْ وَلَن تُفْلِحُوٓا إِذًا أَبَدًا

Innahum in yathharoo AAalaykumyarjumookum aw yuAAeedookum fee millatihim walan tuflihooithan abada

Indeed, if they come to know of you, they will stone you or return you to their religion. And never would you succeed, then - ever."