King James Version
Now therefore hold him not guiltless: for thou art a wise man, and knowest what thou oughtest to do unto him; but his hoar head bring thou down to the grave with blood.English Standard Version
Now therefore do not hold him guiltless, for you are a wise man. You will know what you ought to do to him, and you shall bring his gray head down with blood to Sheol."Catholic Public Domain Version
yet do not choose to treat him as if he were innocent. Since you are a wise man, you will know what to do with him. And you shall lead away his grey hair to death with blood.