فَلَوْلَا إِذْ جَاءَهُم بَأْسُنَا تَضَرَّعُوا وَلَكِن قَسَتْ قُلُوبُهُمْ وَزَيَّنَ لَهُمُ الشَّيْطَانُ مَا كَانُوا يَعْمَلُونَ
Why did they not entreat when Our punishment overtook them! But their hearts had hardened, and Satan had made what they had been doing seem decorous to them.
Agha Ali Puya Commentary
Commentary on Quran 6:43
[Pooya/Ali Commentary 6:43] Having inadvertently sinned, if man does not turn repentant to Allah so that he would have been forgiven, but, on the contrary, becomes stubborn and hardhearted, Shaytan gets his opportunity to exploit him by putting forward the alluring pleasures of his vanity fair.