Sunan Ibn Majah 1180
سنن ابن ماجه#1180SahihIt was narrated from Anas bin Malik that the Prophet (ﷺ) did not raise his hands in any of his supplications except when praying for rain (Istisqa’), when he raised his hands so high that the whiteness of his armpits could be seen
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 5:378