Anas bin Malik reported,

The Prophet ﷺ did not raise his hands in any of his supplications except during the prayer for rain, and he would raise them so high that the whiteness of his armpits became visible.

Bukhari 1031

Sahih

حدثنا محمد بن بشار حدثنا يحيى وابن أبي عدي عن سعيد عن قتادة

عن أنس بن مالك قال

كان النبي ﷺ لا يرفع يديه في شيء من دعائه إلا في الاستسقاء وإنه يرفع حتى يرى بياض إبطيه

البخاري 1031صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Istisqa
Chapter
Raising of the hands by the imam in the rain prayer
Numbering
Darussalam 1031
Bukhari 1031