The Messenger of Allah ﷺ said, "Injustice will be layers of darkness on the Day of Resurrection."
حدثنا أبو سعيد حدثنا عبد العزيز حدثنا عبد الله بن دينار
أن رسول الله ﷺ قال الظلم ظلمات يوم القيامة
Its isnad is sahih. Abu Saeed is the freedman of Banu Hashim, Abdul-Rahman bin Abdullah. Abdul-Aziz is the son of Abdullah bin Abu Salama Majishun. The hadith was narrated by Bukhari 5:73 and Muslim 2:283, both by way of Abdul-Aziz Majishun from Abdullah bin Dinar, with this wording. It has already appeared by way of Abdul-Aziz as well, at 6210. It has also already appeared at greater length through the narration of Ata bin Saaib from Muharib bin Dithar from Ibn Umar, at 5622, 5832, and 6206.