Al-Hajj 22:7

Waanna assaAAata atiyatunla rayba feeha waanna Allaha yabAAathu manfee alquboor

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

and that the Hour (of Doom) has to come, in which there is no doubt, and that Allah will raise again all those in the graves.