Sahih Bukhari

Narrated By Anas : I heard from Allah's Apostle a narration which none other than I will narrate to you. The Prophet, said, "From among the portents of the Hour are the following: General ignorance (in religious affairs) will prevail, (religious) knowledge will decrease, illegal sexual intercourse will prevail, alcoholic drinks will be drunk (in abundance), men will decrease and women will increase so much so that for every fifty women there will be one man to look after them."