What is Prophet Muhammad (saw) known for saying about the sanctuary of Medina between its Harrat mountains?
 Narrated Abu Huraira:                     The Prophet said, "I have made Medina a sanctuary between its two (Harrat) mountains." The Prophet went to the tribe of Bani Haritha and said (to them), "I see that you have gone out of the sanctuary," but looking around, he added, "No, you are inside the sanctuary."