Musnad Ahmad 30:914

'Abd al-Rahman narrated to us, Sufyan narrated to us, from Simak, 'Abd Allah ibn Zalim narrated to us, he said: I heard Abu Hurayrah, he said: 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."