Fussilat 41:27

Falanutheeqanna allatheenakafaroo AAathaban shadeedan walanajziyannahum aswaa allatheekanoo yaAAmaloon

But We will surely cause those who disbelieve to taste a severe punishment, and We will surely recompense them for the worst of what they had been doing.

So, We will certainly make them taste a severe punishment, and will certainly recompense them for the worst of what they used to do.