Sahih Al Bukhari 1: Chapter 3, Hadith 80

(80) (What is said regarding) the disappearance of the (religious) knowledge and the appearance of (religious) ignorance

حَدَّثَنَا عِمْرَانُ بْنُ مَيْسَرَةَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا عَبْدُ الْوَارِثِ، ‏‏‏‏‏‏عَنْ أَبِي التَّيَّاحِ، ‏‏‏‏‏‏عَنْ أَنَسِ بْنِ مَالِكٍ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ "إِنَّ مِنْ أَشْرَاطِ السَّاعَةِ أَنْ يُرْفَعَ الْعِلْمُ، ‏‏‏‏‏‏وَيَثْبُتَ الْجَهْلُ، ‏‏‏‏‏‏وَيُشْرَبَ الْخَمْرُ، ‏‏‏‏‏‏وَيَظْهَرَ الزِّنَا".

SAHIH HADITH:

Narrated Anas: Allah's Apostle 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.

REFERENCE:

Sahih Al Bukhari 1: Chapter 3, Hadith 80