Sahih Al Bukhari Hadith Number 1018

Narrated Anas bin Malik: I p man complained to the Prophet (peace be upon him) about the destruction of livestock and property and the hunger of the offspring. So he invoked (Allah for rain. The narrator (Anas) did not mention that the Prophet (peace be upon him) had worn his cloak inside out or faced the Qibla.

15  Invoking Allah for Rain (Istisqaa)
Hadith number 1018
Volume no 2
Chapter: 11 (The saying that “The Prophet (peace be upon him) did not turn his cloak inside out during the invocation for rain on Friday.”)