Hadith ~ Beware of Injustice

Jabir reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Beware of injustice. Injustice will be darkness on the Day of Rising. Beware of avarice. Avarice destroyed those before you and prompted them to shed each other's blood and make lawful what was unlawful." [Muslim]

Riyad as-Salihin (The Meadows of the Righteous) of Iman Mohieddine Annawawi 631-676.  Chapter 26: "On injustice and the command to make restitution in cases of injustice", Hadith  203.