self-wronging (dhulm al-nafs)

سَآءَ مَثَلًا ٱلْقَوْمُ ٱلَّذِينَ كَذَّبُوا۟ بِـَٔايَـٰتِنَا وَأَنفُسَهُمْ كَانُوا۟ يَظْلِمُونَ

How evil an example [is that of] the people who denied Our signs and used to wrong themselves.