Musnad Abu Ya'la al-Mawsili 3:352

Abu Khaythama narrated to us, Waki' narrated to us, from Hisham ibn 'Urwah, from his father, from 'Abdullah ibn Ja'far, from 'Ali, who said: The Messenger of Allah (ﷺ) said: "The best of its women is Khadijah, and the best of its women is Maryam."