The Messenger of Allah ﷺ went out to the prayer ground to seek rain, and when he wanted to make supplication, he faced the qiblah and turned his cloak inside out.
أن رسول الله ﷺ خرج إلى المصلى يستسقي، وأنه لما أراد أن يدعو استقبل القبلة وحول رداءه.
Bukhari narrated it in the Book of Rain Prayer (1028), and Muslim (894:3), both through Yahya bin Saeed (he is Ansari), who said, Abu Bakr bin Muhammad bin Amr (he is Ibn Hazm) informed me, that Abbad bin Tamim informed him, that Abdullah bin Zayd Ansari informed him, and he mentioned it.