Musnad Ahmad 269:2

Hashim narrated to us, from Ibn Abi Dhi'b, and Yazid—Ibn Abi Dhi'b said—from Sa'id ibn Khalid, from Sa'id ibn al-Musayyib, from 'Abd al-Rahman ibn 'Uthman, who said: "A physician mentioned medicine in the presence of the Messenger of Allah, may Allah bless him and grant him peace, and he mentioned the frog being used in medicine, so the Messenger of Allah, may Allah bless him and grant him peace, forbade killing it." 16070 - Surayj and Harun narrated to us, they said: Ibn Wahb narrated to us, from 'Amr ibn al-Harith, from Bukayr ibn al-Ashajj, from Yahya ibn 'Abd al-Rahman ibn Hatib, from 'Abd al-Rahman ibn 'Uthman al-Taymi, "that the Messenger of Allah, may Allah bless him and grant him peace, forbade the lost property of the pilgrim." And Harun said in his hadith: 'Amr ibn al-Harith said: 'Abdullah said: And I heard it from Harun.