Musnad Ahmad 25:1384

Yahya narrated to us, Abd al-Malik narrated to us, from Ata, from Ibn Abbas: I spent the night in the house of my maternal aunt, Maymunah. The Messenger of Allah (peace and blessings of Allah be upon him) stood up during the night, untied the water skin, and performed ablution. Then he stood up for prayer. I stood up and performed ablution, and I stood on his left side. He took my right hand, turned me around, and placed me on his right side, and I prayed with him.