Deuteronomy 19:10

10 so that there is no chance of innocent blood being spilled in your land. God, your God, is giving you this land as an inheritance - you don't want to pollute it with innocent blood and bring bloodguilt upon yourselves.

Deuteronomy 19:10 Meaning and Commentary

Deuteronomy 19:10

That innocent blood be not shed
As it would be if such a slayer as before described was killed by the avenger of blood, before he could get to one of these cities of refuge, or supposing that they had not bean appointed, or a sufficient number of them:

which the Lord thy God giveth thee for an inheritance;
to be enjoyed by them and their children after them, provided they did not defile it by their sins, but observed the commands of the Lord to obey them and

so blood be upon thee;
the guilt of innocent blood crying for vengeance, as would be the case if such a man's blood was shed as before described; it seems as if the guilt would rather affect the whole land, for not having a proper provision of "asylums" for such persons, than the avenger of blood.

Deuteronomy 19:10 In-Context

8 When God, your God, enlarges your land, extending its borders as he solemnly promised your ancestors, by giving you the whole land he promised them

9 because you are diligently living the way I'm commanding you today, namely, to love God, your God, and do what he tells you all your life; and when that happens, then add three more to these three cities

10 so that there is no chance of innocent blood being spilled in your land. God, your God, is giving you this land as an inheritance - you don't want to pollute it with innocent blood and bring bloodguilt upon yourselves.

11 On the other hand, if a man with a history of hatred toward his neighbor waits in ambush, then jumps him, mauls and kills him, and then runs to one of these cities, that's a different story.

12 The elders of his own city are to send for him and have him brought back. They are to hand him over to the avenger of blood for execution.