Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Oppression will be darknesses on the Day of Resurrection."
Hadith Referenceمسند الشهاب / 109
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه البخاري 2447، ومسلم : 2579»