Musnad Ahmad 25:1620

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, he said: 'Ata' informed me, from Ibn 'Abbas, he said: I spent a night at the house of my maternal aunt, Maymunah. The Prophet, peace and blessings of Allah be upon him, stood up to pray a voluntary prayer during the night. The Prophet, peace and blessings of Allah be upon him, stood up to the water skin and performed ablution, then he stood to pray. I stood up when I saw him do that, and I performed ablution from the water skin. Then I stood to his left side. He took my hand from behind my back, adjusting me in that manner from behind his back to the right side.