Malik bin Zalim narrates: I heard Sayyiduna Abu Hurairah (may Allah be pleased with him) saying to Marwan bin Hakam: My beloved, the truthful and trustworthy, Sayyiduna Abu al-Qasim (peace and blessings be upon him) has told me this: "Corruption in my Ummah will be through the foolish youths of the Quraysh."