Musnad Ahmad 938:1

Abu Sa’id, the freed slave of Banu Hashim, narrated to us, saying: ‘Abd al-Rahman ibn Abi al-Rijal narrated to us, from Sharhabil, who said: I caught a *nahs* (a young gazelle or a wild animal) in al-Asyaf. Zayd ibn Thabit took it from me and let it go. He said: "Do you not know that the Messenger of Allah, may Allah bless him and grant him peace, declared sacred what is between its two lava fields (the two Harrahs of Medina)?"