Musannaf Ibn Abi Shayba 16:115

Abu Bakr narrated to us, he said: Ubayd Allah ibn Sa'id narrated to us, from Sufyan, from Mansur, from Ibrahim, from al-Aswad, from Aisha, who said: A dabb (lizard) was gifted to the Messenger of Allah, may Allah bless him and grant him peace, and he did not eat from it. She said: I said, "O Messenger of Allah, shall I feed it to the beggars?" He said: "Do not feed the beggars what you do not eat from."