From Sahih Bukhari (Hadith 1869):
Narrated Abu Huraira:The Prophet (ﷺ) said, "I have made Medina a sanctuary between its two (Harrat) mountains." The Prophet (ﷺ) 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
Reference: Bukhari 1869