Musnad Ahmad 32:1152

Yazid narrated to us, Shu'bah narrated to us, from Qatadah, from Anas ibn Malik, who said: I shall narrate to you a hadith that no one will narrate to you after me; I heard it from the Messenger of Allah, peace and blessings of Allah be upon him. He said: "Indeed, among the signs of the Hour are that knowledge will be lifted, ignorance will appear, wine will be drunk, and adultery will become widespread. Men will decrease and women will increase, until for fifty women there will be one guardian."