The Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), said: "You were commanded to seek forgiveness for your predecessors (the early generations), yet you reviled them! Listen, I heard your Prophet (peace and blessings be upon him) say: 'This Ummah will not come to an end until its later people curse its earlier people.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abd al-Malik bin Umayr except Isma'il bin Ibrahim, and no one from Isma'il except Ubayd bin Sa'id, and Yusuf al-Saffar is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5241
Hadith Gradingمحدثین:إسناده ضعيف لضعف إسماعيل بن إبراهيم بن مهاجر
Hadith Takhrij«قال الهيثمي: فيه إسماعيل بن إبراهيم بن مهاجر وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 10، ص 21»»