﴿ وَلَا يَزَالُ ٱلَّذِينَ كَفَرُوا۟ فِى مِرْيَةٍۢ مِّنْهُ حَتَّىٰ تَأْتِيَهُمُ ٱلسَّاعَةُ بَغْتَةً أَوْ يَأْتِيَهُمْ عَذَابُ يَوْمٍ عَقِيمٍ ﴾

“whereas those who are bent on denying the truth will not cease to be in doubt about Him until the Last Hour comes suddenly upon them and [supreme] suffering befalls them on a Day void of all hope.”

(And those who disbelieve) in Muhammad (pbuh) and in the Qur'an, i.e. al-Walid Ibn al-Mughirah and his host (will not cease to be in doubt thereof) in doubt of the Qur'an, but wait, O Muhammad, (until the Hour) the Last Hour (come upon them unawares) all of a sudden, (or there come unto them the doom of a disastrous day) in which there is no comfort, this is the Day of Badr.