Qur'an 22:7 Al-Hajj

وَأَنَّ ٱلسَّاعَةَ ءَاتِيَةٌۭ لَّا رَيْبَ فِيهَا وَأَنَّ ٱللَّهَ يَبْعَثُ مَن فِى ٱلْقُبُورِ

And [that they may know] that the Hour is coming - no doubt about it - and that Allah will resurrect those in the graves.

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