Mishkat al-Masabih
Mishkat al-Masabih 1499
Prayer for Rain - Section 1
Arabic hadith text
وَعَنْ أَنَسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ اسْتَسْقَى فَأَشَارَ بِظَهْرِ كَفَّيْهِ إِلَى السَّمَاءِ. رَوَاهُ مُسلم
Translation
He said the Prophet prayed for rain pointing the back of his hands to the sky. Muslim transmitted it.