That which is altogether just; literally, justice, justice. The repetition of the word is for the sake of emphasis, as in Genesis 14:10, "pits, pits," equal to full of pits.
In all states, the highest crime of which the judge has to take note is that of treason against the supreme Rower; and, under the theocracy, the act most distinctly treasonable was idolatry. In proceeding, therefore, to give some practical admonitions as to the things to be observed in the administration of justice, Moses begins by denouncing and forbidding this most flagrant form of iniquity.