The demons were angels who became discontented with “their original position but forsook their own proper dwelling place ” for something to which they were not entitled.
مَثَلًا ،‏ كَانَ ٱلشَّيْطَانُ أَوَّلَ مَنِ ٱشْتَهَى مَا هُوَ لِسِوَاهُ :‏ اَلْمَجْدُ وَٱلْكَرَامَةُ وَٱلسُّلْطَةُ ٱلَّتِي لَا تَحِقُّ إِلَّا لِيَهْوَه .‏