Musnad Ahmad 1153:1197

Hajjaj narrated to us, Laith narrated to us, 'Aqil narrated to me, from Ibn Shihab, from 'Urwah ibn al-Zubayr, that 'Aishah, the wife of the Prophet, may Allah bless him and grant him peace, informed him: That the Messenger of Allah, may Allah bless him and grant him peace, said regarding the gecko: "A little wicked one (fuwaysiq)." And I did not hear him command its killing.