Messenger of Allah ﷺ said, "From among the portents of the Hour are (the following): -1. Religious knowledge will be taken away (by the death of Religious learned men). -2. (Religious) ignorance will prevail. -3. Drinking of Alcoholic drinks (will be very common). -4. There will be prevalence of open illegal sexual intercourse. (Using translation from Bukhārī 80)  

قَالَ رَسُولُ اللهِ ﷺ «مِنْ أَشْرَاطِ السَّاعَةِ أَنْ يُرْفَعَ الْعِلْمُ وَيَثْبُتَ الْجَهْلُ وَيُشْرَبُ الْخَمْرُ وَيَظْهَرُ الزِّنَا»  

“Shall I not tell you a Hadith that I heard from the Messenger of Allah ﷺ, which no one will tell you after me? I heard it from him (saying): ‘Among the portents of the Hour are that knowledge will be taken away and ignorance will prevail, illegal sex will become widespread and wine will be drunk, and men will disappear and women will be left, until there is one man in charge of fifty women.” (Using translation from Ibn Mājah 4045)  

أَلَا أُحَدِّثُكُمْ حَدِيثًا سَمِعْتُهُ مِنْ رَسُولِ اللهِ ﷺ لَا يُحَدِّثُكُمْ أَحَدٌ بَعْدِي سَمِعَهُ مِنْهُ «إِنَّ مِنْ أَشْرَاطِ السَّاعَةِ أَنْ يُرْفَعَ الْعِلْمُ وَيَظْهَرُ الْجَهْلُ وَيَفْشُو الزِّنَا وَيُشْرَبُ الْخَمْرُ وَيَذْهَبُ الرِّجَالُ وَيَبْقَى النِّسَاءُ حَتَّى يَكُونَ لِخَمْسِينَ امْرَأَةً قَيِّمٌ وَاحِدٌ»