He said the Prophet (sallallahu alayhi wa sallam) prayed for rain pointing the back of his hands to the sky.
وَعَنْ أَنَسٍ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ اسْتَسْقَى فَأَشَارَ بِظَهْرِ كَفَّيْهِ إِلَى السَّمَاءِ
He said the Prophet (sallallahu alayhi wa sallam) prayed for rain pointing the back of his hands to the sky.
Who passed it on, from Al-Khatib at-Tibrizi back to the one who was there.
The same words, in another collection.
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