Deuteronomy 21:9

9 This is how you will get rid of the guilt of an unsolved murder by doing what the LORD considers right.

Deuteronomy 21:9 Meaning and Commentary

Deuteronomy 21:9

So shalt thou put away the guilt of innocent blood from among
you
Which otherwise, the person not being found out, and brought to just punishment for it, would devolve upon the whole. Aben Ezra interprets it the punishment of innocent blood, which, by the above method being taken, would not be inflicted on them:

when thou shalt do that which is right in the sight of the Lord;
as it was to observe this law concerning the beheading of the heifer, with all the rites and ceremonies belonging to it here enjoined; as well as every other command, statute, and ordinance of the Lord, which are all right to be done, ( Psalms 19:8 ) .

Deuteronomy 21:9 In-Context

7 Then they must make this formal statement: "We didn't commit this murder, and we didn't witness it.

8 LORD, make peace with your people Israel, whom you freed. Don't let the guilt of this unsolved murder remain among your people Israel." Then there will be peace with the LORD despite the murder.

9 This is how you will get rid of the guilt of an unsolved murder by doing what the LORD considers right.

10 When you go to war with your enemies and the LORD your God hands them over to you, you may take them captive.

11 If you see a beautiful woman among the captives and have your heart set on her, you may marry her.