It 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.  

أَنَّ نَبِيَّ اللَّهِ ﷺ كَانَ لاَ يَرْفَعُ يَدَيْهِ فِي شَىْءٍ مِنْ دُعَائِهِ إِلاَّ عِنْدَ الاِسْتِسْقَاءِ فَإِنَّهُ كَانَ يَرْفَعُ يَدَيْهِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ