(225) بَابُ الظُّلْمُ ظُلُمَاتٌ
Abu Hurayra reported that the Prophet, may Allah bless him andgrant him peace, said, "Beware of injustice. Injustice will appear as darknesson the Day of Rising. Beware of coarseness. Allah does not love those whoare coarse and foul mouthed. Beware of avarice for it destroyed those beforeyou. They cut off their relatives. Allah summoned them and they made lawfulwhat was unlawful."
Reference: Al-Adab Al-Mufrad 487
In-book reference: Book 28, Hadith 5
English translation: Book 28, Hadith 487