Sahih Muslim , Book 15, Hadith 545 (In-Book) ⓘ
Sahl b. Hunif reported that Allah's Messenger pointed with his hands towards Medina and said: That is a sacred territory and a place of safety.
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنِ الشَّيْبَانِيِّ، عَنْ يُسَيْرِ، بْنِ عَمْرٍو عَنْ سَهْلِ بْنِ حُنَيْفٍ، قَالَ أَهْوَى رَسُولُ اللَّهِ صلى الله عليه وسلم بِيَدِهِ إِلَى الْمَدِينَةِ فَقَالَ " إِنَّهَا حَرَمٌ آمِنٌ " .
also referenced under: Hadith 1375 (Reference) & Book 7, Hadith 3177 (USC-MSA)