Sahih Bukhari Volume 002, Book 017, Hadith Number 146.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 17. Invoking Allah for Rain (Istisqaa)
Narated By Abu Huraira : The Prophet said, "The Hour (Last Day) will not be established until (religious) knowledge will be taken away (by the death of religious learned men), earthquakes will be very frequent, time will pass quickly, afflictions will appear, murders will increase and money will overflow amongst you." (See Hadith No. 85 Vol 1).