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. (Using translation from Ibn Mājah 1180)
أَنَّ نَبِيَّ اللهِ ﷺ كَانَ «لَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنْ دُعَائِهِ إِلَّا عِنْدَ الِاسْتِسْقَاءَ فَإِنَّهُ كَانَ يَرْفَعُ يَدَيْهِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ»