Al-Kahf 20

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

Innahum in yathharoo AAalaykum yarjumookum aw yuAAeedookum fee millatihim walan tuflihoo ithan abadan

"For if they come to know of you, they will stone you (to death or abuse and harm you) or turn you back to their religion, and in that case you will never be successful." The Noble Quran