إِنَّ الَّذِينَ ارْتَدُّوا عَلَى أَدْبَارِهِمVerily, those who have turned back,meaning, they departed from the faith and returned to disbelief.مِّن بَعْدِ مَا تَبَيَّنَ لَهُمُ الْهُدَىالشَّيْطَانُ سَوَّلَ لَهُمْ after guidance had become clear to them -- Shaytan has enticed them,meaning he adorned and beautified that (apostasy) for them.وَأَمْلَى لَهُمْand filled them with false hopes.meaning, he tempted them, and deceived them