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."
Sahih al-Bukhari Book 80, Hadith 78