Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Your Lord says: By My Might and My Majesty, I will surely take revenge on the oppressor, whether soon or late, and I will surely take revenge on the one who sees an oppressed person and has the ability to help him, yet does not do so."
Al-Tabarani recorded it in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat, and its chain contains a narrator whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12135
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير “ (10652) ، أخرجه المعجم الكبير للطبراني برقم: 10652، وأخرجه المعجم الأوسط للطبراني برقم: 36»