Sahih Bukhari
Sahih Bukhari Volume 002, Book 017, Hadith Number 119.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 17. Invoking Allah for Rain (Istisqaa)
Narated By 'Abbas bin Tamim's uncle : The Prophet (p.b.u.h) went out to offer the Istisqa' prayer and turned (and put on) his cloak inside out.