Musnad Ahmad 1153:555

Bishr ibn Shu'ayb ibn Abi Hamzah narrated to us, he said: And my father informed me, Muhammad said: Urwah informed me that Aisha informed him: That the Messenger of Allah (peace and blessings of Allah be upon him) said regarding the gecko: "A little corruptor (fuwaysiq)." And I did not hear him command its killing.