Deuteronomy 21:9

9 So you shall purge from among you the guilt of shedding innocent blood, since you have done what is right in the eyes of the LORD.

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 and they shall declare, “Our hands did not shed this blood, nor did our eyes see it.

8 Accept this atonement, O LORD, for Your people Israel whom You have redeemed, and do not hold the shedding of innocent blood against them.” And the bloodshed will be atoned for.

9 So you shall purge from among you the guilt of shedding innocent blood, since you have done what is right in the eyes of the LORD.

10 When you go to war against your enemies and the LORD your God delivers them into your hand and you take them captive,

11 if you see a beautiful woman among them, and you desire her and want to take her as your wife,