Musnad Ahmad 30:3162

'Abd al-Rahman narrated to us, from Sufyan, from Simak, who said: 'Abd Allah ibn Zalim narrated to me, saying: I heard Abu Hurayrah say: I heard my beloved, Abu al-Qasim (may Allah bless him and grant him peace), saying: "The corruption of my nation will be at the hands of foolish youths from Quraysh."