From Sahih Bukhari (Hadith 5577):
Narrated Anas:I heard from Allah's Messenger (ﷺ) a narration which none other than I will narrate to you. The Prophet, said, "From among the portents of the our 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
Reference: Bukhari 5577