Musnad Ahmad 32:1287

'Abd al-Malik ibn 'Amr narrated to us, Hisham—meaning Ibn Sunbur Abu 'Abd Allah—narrated to us, from Qatadah, from Anas, who said: I shall narrate to you a hadith that no one who heard it from the Messenger of Allah (peace and blessings of Allah be upon him) after me will narrate to you. I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Indeed, among the signs of the Hour are: that knowledge will be lifted, ignorance will appear, wine will be drunk, adultery will become widespread, men will decrease, and women will increase, until there is one guardian for fifty women."