Sayyidah Maymunah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), said: I heard the Prophet (peace and blessings be upon him) say: "My Ummah will remain upon goodness, and its affairs will remain firmly held together, so long as children of fornication do not become prominent among them. When they become prominent, I fear that Allah will afflict them all with punishment."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20426