Quran 3:85 from Surah Aal-i-Imraan on Divine Marvels.
وَمَن يَبۡتَغِ غَيۡرَ ٱلۡإِسۡلَٰمِ دِينٗا فَلَن يُقۡبَلَ مِنۡهُ وَهُوَ فِي ٱلۡأٓخِرَةِ مِنَ ٱلۡخَٰسِرِينَ
English translation: And whoever seeks other than [the] Islam (as) religion then never will be accepted from him and he in the Hereafter (will be) from the losers
Transliteration: waman yabtaghi ghayra al-is'lami dinan falan yuq'bala min'hu wahuwa fi al-akhirati mina al-khasirina