Surah Aali Imran (The Family of Imran), Verse 85

وَمَنْ یَّبْتَغِ غَیْرَ الْاِسْلَامِ دِیْنًا فَلَنْ یُّقْبَلَ مِنْهُ وَهُوَ فِی الْاٰخِرَةِ مِنَ الْخٰسِرِیْنَ ۟

Wa mai yabtaghi ghairal Islaami deenan falany yuqbala minhu wa huwa fil Aakhirati minal khaasireen

“If anyone desires a religion other than Islam (submission to Allah), never will it be accepted of him; and in the Hereafter He will be in the ranks of those who have lost (All spiritual good).”

Quran 3:85 (Yusuf Ali Translation)