'Righteous' in the Bible

Yahweh will return his blood on his own head, because he fell on two men more righteous and better than he, and killed them with the sword, and my father David didn't know it: Abner the son of Ner, captain of the army of Israel, and Amasa the son of Jether, captain of the army of Judah.

then hear in heaven, and do, and judge your servants, condemning the wicked, to bring his way on his own head, and justifying the righteous, to give him according to his righteousness.