'The Lord also spake unto Joshua, saying, 2. Speak to the children of Israel, saying, Appoint out for you cities of refuge, whereof I spake unto you by the hand of Moses: 3. That the slayer that killeth any person unawares and unwittingly may flee thither: and they shall be your refuge from the avenger of blood. 4. And when he that doth flee unto one of those cities shall stand at the entering of the gate of the city, and shall declare his cause in the ears of the elders of that city, they shall take him into the city unto them, and give him a place, that he may dwell among them. 5. And if the avenger of blood pursue after him, then they shall not deliver the slayer up into his hand; because he smote his neighbour unwittingly, and hated him not beforetime. 6. And he shall dwell in that city, until he stand before the congregation for judgment, and until the death of the high priest that shall be in those days: then shall the slayer return, and come unto his own city, and unto his own house, unto the city from whence he fled. 7. And they appointed Kedesh in Galilee in mount Naphtali, and Shechem in mount Ephraim, and Kirjath-arba, which is Hebron, in the mountain of Judah. 8. And on the other side Jordan by Jericho eastward, they assigned Bezer in the wilderness upon the plain out of the tribe of Reuben, and Ramoth in Gilead out of the tribe of Gad, and Golan in Bashan out of the tribe of Manasseh. 9. These were the cities appointed for all the children of Israel, and for the stranger that sojourneth among them, that whosoever killeth any person at unawares might flee thither, and not die by the hand of the avenger of blood, until he stood before the congregation.'--JOSHUA xx. 1-9.
Our Lord has taught us that parts of the Mosaic legislation were given because of the 'hardness' of the people's hearts. The moral and religious condition of the recipients of revelation determines and is taken into account in the form and contents of revelation. That is strikingly obvious in this institution of the 'cities of refuge.' They have no typical meaning, though they may illustrate Christian truth. But their true significance is that they are instances of revelation permitting, and, while permitting, checking, a custom for the abolition of which Israel was not ready.
I. Cities of refuge were needed, because the 'avenger of blood' was recognised as performing an imperative duty. 'Blood for blood' was the law for the then stage of civilisation. The weaker the central authority, the more need for supplementing it with the wild justice of personal avenging. Neither Israel nor surrounding nations were fit for the higher commandment of the Sermon on the Mount. 'An eye for an eye, and a tooth for a tooth,' corresponded to their stage of progress; and to have hurried them forward to 'I say unto you, Resist not evil,' would only have led to weakening the restraint on evil, and would have had no response in the hearers' consciences. It is a commonplace that legislation which is too far ahead of public opinion is useless, except to make hypocrites. And the divine law was shaped in accordance with that truth. Therefore the _goel_, or kinsman-avenger of blood, was not only permitted but enjoined by Moses.
But the evils inherent in his existence were great. Blood feuds were handed down through generations, involving an ever-increasing number of innocent people, and finally leading to more murders than they prevented. But the thing could not be abolished. Therefore it was checked by this institution. The lessons taught by it are the gracious forbearance of God with the imperfections attaching to each stage of His people's moral and religious progress; the uselessness of violent changes forced on people who are not ready for them; the presence of a temporary element in the Old Testament law and ethics.