Umm 'Ayyash, the slave woman of Ruqayyah, the daughter of the Messenger of Allah, said:
"I used to help the Messenger of Allah perform ablution, when I was standing and he was sitting." (DE)
English reference (DE): Vol. 1, Book 1, Hadith 392 (DE)
Arabic reference (DE): Book 1, Hadith 424 (DE)