TSK · Deuteronomy 19:6

And they must stand as your towns of refuge from the avenger in order that the killer may not die until he has stood trial before the community.

When the avenger of blood comes after him, they must not hand over to him the one who committed manslaughter, for he accidentally killed his fellow man without premeditation.

But you should take careful note of this: If you put me to death, you will bring on yourselves and this city and those who live in it the guilt of murdering an innocent man. For the LORD has sent me to speak all this where you can hear it. That is the truth!”