Hadith 2866
Ubad bin Tamim narrates: He heard his uncle, who is a companion of the Prophet (peace be upon him), narrate: One day the Prophet (peace be upon him) went out to perform the prayer for rain (Salat al-Istisqa), and he turned his back to the people and faced the Qiblah, then he turned his cloak inside out and performed two rak'ahs.