اَلْعَدَد 35:11

فَتُعَيِّنُونَ لِأَنْفُسِكُمْ مُدُنًا تَكُونُ مُدُنَ مَلْجَإٍ لَكُمْ، لِيَهْرُبَ إِلَيْهَا ٱلْقَاتِلُ ٱلَّذِي قَتَلَ نَفْسًا سَهْوًا.

Then ye shall appoint you cities to be cities of refuge for you; that the slayer may flee thither, which killeth any person at unawares.