Musnad Ahmad 8:19

Husayn ibn Muhammad narrated to us, al-Fudayl ibn Sulayman narrated to us, Muhammad ibn Abi Yahya narrated to us, from Abu Ishaq ibn Salim, from Amir ibn Sa’d, from Sa’d ibn Abi Waqqas, who said: "What is between the two lava fields (labbatan) of Medina is sacred. The Messenger of Allah, may Allah bless him and grant him peace, has made it sacred, just as Abraham made Mecca sacred. O Allah, make the blessing in it two blessings, and bless them in their sa’ and their mudd."