Musnad Ahmad 32:1000

Zayd ibn Yahya al-Dimashqi narrated to us, Abu Mu'id narrated to us, Makhul narrated to us, from Anas ibn Malik, who said: It was said: "O Messenger of Allah, when shall we abandon enjoining the good and forbidding the evil?" He said: "When that which appeared among the Children of Israel appears among you: when indecency is among your elders, sovereignty is among your youth, and knowledge is among your base people."