23:74
وَإِنَّ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱلْـَٔاخِرَةِ عَنِ ٱلصِّرَٰطِ لَنَـٰكِبُونَ
wa-inna alladhīna lā yu'minūna bil-ākhirati ʿani l-ṣirāṭi lanākibūna
and those who do not believe in the Hereafter turn away from that path.
And verily, those who believe not in the Hereafter are indeed deviating far astray from the Path (true religion - Islâmic Monotheism).