That enemy is Satan the Devil. Second, no matter what trials we may encounter, having a close relationship with God will enable us to maintain our integrity.
أَوَّلًا ،‏ تَكْشِفُ تَجَارِبُ أَيُّوبَ ٱلْقِنَاعَ عَنْ عَدُوِّ ٱلْبَشَرِ ٱلْحَقِيقِيِّ وَمَصْدَرِ ٱلْمُقَاوَمَةِ ٱلَّتِي يُعَانِيهَا شَعْبُ ٱللهِ :‏ اَلشَّيْطَانِ إِبْلِيسَ .‏