﴿ كَلَّا ۖ بَلْ ۜ رَانَ عَلَىٰ قُلُوبِهِم مَّا كَانُوا۟ يَكْسِبُونَ ﴾

“Nay, but their hearts are corroded by all [the evil] that they were wont to do!”

No indeed! — a deterrent and a warning against saying such things. Rather there has slayed engulfed their hearts covering them like rust that which they earned of acts of disobedience.