Sahih Muslim Book 45, Hadith 74

Be on your guard against committing oppression, for oppression is a darkness on the Day of Resurrection, and be on your guard against stinginess for stinginess destroyed those who were before you, as it incited them to shed blood and make lawful what was unlawful for them.

Previous Hadith

Verily I have made oppression unlawful for Me and for My servants too, so do not commit oppression. The rest of the hadith is the same.

Sahih Muslim Book 45, Hadith 73
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Oppression is the darkness on the Day of Resurrection.

Sahih Muslim Book 45, Hadith 75