The Prophet (ﷺ) went out towards the Musalla in order to offer the Istisqa' prayer and when he intended to invoke (Allah) or started invoking, he faced the Qibla and turned his cloak inside out.
Reference: Sahih al-Bukhari 1028 In-book : Book 15, Hadith 23 USC-MSA web (English) : Vol. 2, Book 17, Hadith 140 (deprecated)
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