Sahih Muslim
The Book of Knowledge (Kitab Al-Ilm)
Book Number: 034 / Hadith Number: 6451
Anas b. Malik reported Allah's Messenger (may peace be upon him) as saying: It is from the conditions of the Last Hour that knowledge would be taken away and ignorance would prevail (upon the world), the liquor would be drunk, and adultery would become rainpant.