Musnad Abu Ya'la al-Mawsili 115:60

Surayj ibn Yunus narrated to us, al-Qasim narrated to us, Sa'id narrated to us, from Qatadah, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The Hour will not be established until knowledge is lifted, ignorance appears, women become numerous, and men become few, until one man is the guardian of fifty women."