Mishkat al-Masabih #1418
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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
Anas said the Prophet 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.)
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About Mishkat al-Masabih
This hadith is #1418 from Mishkat al-Masabih, in the Book of Prayer.