The Prophet (sallallahu alayhi wa sallam) prayed for rain pointing the back of his palms to the sky.
وَعَنْ أَنَسٍ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ اسْتَسْقَى فَأَشَارَ بِظَهْرِ كَفَّيْهِ إِلَى اَلسَّمَاءِ»
The Prophet (sallallahu alayhi wa sallam) prayed for rain pointing the back of his palms to the sky.
صحيح. رواه مسلم (896)
Who passed it on, from Ibn Hajar back to the one who was there.
The same words, in another collection.
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