Sahih Bukhari: Hadith 6576

I will narrate to you a narration which nobody will narrate to you after me. I heard that from the Prophet. I heard the Prophet (ﷺ) saying, "The Hour will not be established" or said: "From among the portents of the Hour is that the religious knowledge will betaken away (by the death of religious Scholars) and general ignorance (of religion) will appear; and the drinking of alcoholic drinks will be very common, and (open) illegal sexual intercourse will prevail, and men will decrease in number while women will increase so much so that, for fifty women there will only be one man to look after them."