Deuteronomy 21:9

9 So shalt thou put away the guilt of innocent blood from among you, when thou shalt do that which is right in the sight 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 answer and say, Our hands have not shed this blood, neither have our eyes seen it.

8 Be merciful, O LORD, unto thy people Israel, whom thou hast redeemed, and lay not innocent blood unto thy people of Israel's charge. And the blood shall be forgiven them.

9 So shalt thou put away the guilt of innocent blood from among you, when thou shalt do that which is right in the sight of the LORD.

10 When thou goest forth to war against thine enemies, and the LORD thy God hath delivered them into thine hands, and thou hast taken them captive,

11 And seest among the captives a beautiful woman, and hast a desire unto her, that thou wouldest have her to thy wife;