وَيَستَعجِلونَكَ بِالعَذابِ ۚ وَلَولا أَجَلٌ مُسَمًّى لَجاءَهُمُ العَذابُ وَلَيَأتِيَنَّهُم بَغتَةً وَهُم لا يَشعُرونَ

They urge you to hasten the punishment. If not for a set term, the punishment would’ve already come upon them. Yet, it will come upon them suddenly while they are unaware.