Bukhari :: Book 8 :: Volume 75 :: Hadith 354

Narrated 'Abdullah bin Zaid:

Allah's Apostle went out to this Musalla (praying place) to offer the prayer of Istisqa.' He invoked Allah for rain and then faced the Qibla and turned his Rida' (upper garment) inside out.

Source materials are from the University of Southern California MSA site
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