Qur'an 3:85

وَمَن يَبْتَغِ غَيْرَ ٱلْإِسْلَـٰمِ دِينًا فَلَن يُقْبَلَ مِنْهُ وَهُوَ فِى ٱلْـَٔاخِرَةِ مِنَ ٱلْخَـٰسِرِينَ

“And whoever desires other than Islām as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.”

Aal-i-Imraan 3:85 · Saheeh International