Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 476

Narrated Mirdas Al-Aslami:

Who was among those (who had given the Pledge of allegiance) under the Tree: Pious people will die in succession, and there will remain the dregs of society who will be like the useless residues of dates and barley and Allah will pay no attention to them.