Exodus 23:7

ונקי וצדיק אל תהרג AND THE GUILTLESS AND RIGHTEOUS SLAY THOU NOT — Whence may we infer that in the case that one who left the court after being found guilty and one says, “I have something to plead in his favour”, he has to be brought back in order that the court may listen to this? From what Scripture states, “and the נקי thou shalt not slay”. Although he is not a צדיק — for he has not been acquitted by the court — he is however “free” (נקי) from the death penalty, for it is your duty to plead — as far as possible — in his favour. And whence may we infer, on the other hand, that in the case of one who left the court after having been acquitted and one says, “I have something to say against him” he is not to be brought back that the judges may hear this? From what Scripture states: “and the צדיק slay thou not” — and this man is a צדיק since he has been acquitted by the court (Sanhedrin 33b). כי לא אצדיק רשע FOR “I” WILL NOT JUSTIFY THE WICKED — It is not your duty, in the latter case, to bring the man back to the court, for if he is really guilty, “I” will not acquit him in My court. Altough he has left your hands as innocent “I” have many agents (many means) to inflict upon him the death to which he has made himself liable (Mekhilta).

מִדְּבַר־שֶׁ֖קֶר תִּרְחָ֑ק וְנָקִ֤י וְצַדִּיק֙ אַֽל־תַּהֲרֹ֔ג כִּ֥י לֹא־אַצְדִּ֖יק רָשָֽׁע׃

Keep thee far from a false matter; and the innocent and righteous slay thou not: for I will not justify the wicked.