"I used to help the Messenger of Allah perform ablution, when I was standing and he was sitting." (Using translation from Ibn Mājah 392)
عَنْ جَدَّتِهِ أُمِّ أَبِيهِ أُمِّ عَيَّاشٍ وَكَانَتْ أَمَةً لِرُقَيَّةَ بِنْتِ رَسُولِ اللهِ ﷺ قَالَتْ «كُنْتُ أُوَضِّئُ النَّبِيَّ ﷺ وَأَنَا قَائِمَةٌ وَهُوَ قَاعِدٌ»