Sura al-Ḥajj 22:55

وَلَا يَزَالُ ٱلَّذِينَ كَفَرُوا۟ فِى مِرْيَةٍ مِّنْهُ حَتَّىٰ تَأْتِيَهُمُ ٱلسَّاعَةُ بَغْتَةً أَوْ يَأْتِيَهُمْ عَذَابُ يَوْمٍ عَقِيمٍ

wa-lā yazālu lladhīna kafarū fī miryatin minhu ḥattā taʾtiyahumu l-sāʿatu baghtatan aw yaʾtiyahum ʿadhābu yawmin ʿaqīmin

Those who reject Faith will not cease to be in doubt concerning (Revelation) until the Hour (of Judgment) comes suddenly upon them, or there comes to them the Penalty of a Day of Disaster.