Joshua 20:1

1. The Lord also spoke unto Joshua, etc In the fact of its not having occurred to their own minds, to designate the cities of refuge, till they were again reminded of it, their sluggishness appears to be indirectly censured. The divine command to that effect had been given beyond the Jordan. When the reason for it remained always equally valid, why do they wait? Why do they not give full effect to that which they had rightly begun? We may add, how important it was that there should be places of refuge for the innocent, in order that the land might not be polluted with blood. For if that remedy had not been provided, the kindred of those who had been killed would have doubled the evil, by proceeding without discrimination to avenge their death. It certainly did not become the people to be idle in guarding the land from stain and taint. Hence we perceive how tardy men are, not only to perform their duty, but to provide for their own safety, unless the Lord frequently urge them, and prick them forward by the stimulus of exhortation. But that they sinned only from thoughtlessness, is apparent from this, that they are forthwith ready to obey, neither procrastinating nor creating obstacles or delays to a necessary matter, by disputing the propriety of it.

The nature of the asylum afforded by the cities of refuge has been already explained. It gave no impunity to voluntary murder, but if any one, by mistake, had slain a man, with whom he was not at enmity, he found a safe refuge by fleeing to one of these cities destined for that purpose. Thus God assisted the unfortunate, and prevented their suffering the punishment of an atrocious deed, when they had not been guilty of it. Meanwhile respect was so far paid to the feelings of the brethren and kindred of the deceased, that their sorrow was not increased by the constant presence of the persons who had caused their bereavement. Lastly, the people were accustomed to detest murder, since homicide, even when not culpable, was followed by exile from country and home, till the death of the high priest. For that temporary exile clearly showed how precious human blood is in the sight of God. Thus the law was just, equitable, and useful, as well in a public as in a private point of view. But it is to be briefly observed, that everything is not here mentioned in order. For one who had accidentally killed a man might have remained in safety, by sisting himself before the court to plead his cause, and obtaining an acquittal, after due and thorough investigation, as we explained more fully in the books of Moses, when treating of this matter.