Musnad Ahmad 1153:1690

Waki’ narrated to us, he said: Sufyan narrated to us, from ‘Ali ibn al-Aqmar, from Abu Hudhayfah, from ‘Aishah, that she mentioned a woman—and he said once: she mimicked a woman—and she said: "She is short." He [the Prophet] said: "You have backbitten her. I would not love that I mimicked anyone, and that I would have such and such."