Hadith 1498
Mishkat al-Masabih
Prayer · Prayer for Rain - Section 1
Arabic
وَعَنْ أَنَسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنْ دُعَائِهِ إِلَّا فِي الِاسْتِسْقَاءِ فَإِنَّهُ يَرْفَعُ حَتَّى يرى بَيَاض إبطَيْهِ
English translation
Anas said the Prophet (ﷺ) was not accustomed to raise his hands in any supplication he made except when praying for rain. He would then raise them high enough for the whiteness under his armpits to be visible. (Bukhari and Muslim.)