He saw the Messenger of Allah ﷺ, when he prayed for rain, turn to face the Qiblah, turning his cloak around and raising his hands.  

أَنَّهُ رَأَى رَسُولَ اللَّهِ ﷺ فِي الاِسْتِسْقَاءِ اسْتَقْبَلَ الْقِبْلَةَ وَقَلَبَ الرِّدَاءَ وَرَفَعَ يَدَيْهِ