Musnad Abu Ya'la al-Mawsili 126:5

Yahya ibn Ayyub narrated to us, Ismail narrated to us, he said: Abdullah ibn Abd al-Rahman informed me that he heard Anas ibn Malik saying: The Messenger of Allah (may Allah bless him and grant him peace) said: "The superiority of Aisha over the women is like the superiority of tharid over the rest of the food."