Musnad Ahmad 1153:1032

Waki' narrated to us, Sufyan narrated to us, from 'Ali ibn al-Aqmar, from Abu Hudhayfah, from 'Aishah, that she mimicked a woman. The Messenger of Allah (peace and blessings of Allah be upon him) said to her: "I would not like that I mimicked anyone, and that I had such and such [a reward or worldly gain]."