Musnad Ahmad 25:1243

'Abd al-Samad narrated to us, Hammad narrated to us, from 'Abdullah ibn 'Uthman ibn Khuthaym, from Sa'id ibn Jubayr, from Ibn 'Abbas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) was in the house of Maymunah, and she placed water for his ablution for him during the night. Maymunah said to him: "'Abdullah ibn 'Abbas placed this for you." He said: "O Allah, grant him understanding in the religion and teach him the interpretation."