(49) باب الدُّعَاءِ عِنْدَ الْوُضُوءِ
Narrated Abu Musa:
The Prophet (ﷺ) asked for some water and performed the ablution, and then raised his hands (towards the sky) and said, "O Allah! Forgive `Ubaid Abi 'Amir." I saw the whiteness of his armpits (while he was raising his hands) and he added, "O Allah! Upgrade him over many of Your human creatures on the Day of Resurrection."
Reference: Sahih al-Bukhari 6383
In-book reference: Book 80, Hadith 78
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 75, Hadith 392