At-Tawbah 9:125

Waamma allatheena feequloobihim maradun fazadat-hum rijsan ilarijsihim wamatoo wahum kafiroon

But as for those in whose hearts is disease, it has [only] increased them in evil [in addition] to their evil. And they will have died while they are disbelievers.

As for those who have malady in their hearts, it adds further impurity to their (initial) impurity, and they die infidels.