عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَيُّهَا النَّاسُ اتَّقُوا الظُّلْمَ فَإِنَّهُ ظُلُمَاتٌ يَوْمَ الْقِيَامَةِ
Narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: Beware of oppression! For indeed, oppression will become (many) darknesses on the Day of Resurrection.