'Law' in the Bible

For Ezra had set his heart (resolved) to study and interpret the Law of the Lord, and to practice it and teach His statutes and ordinances in Israel.

Whoever does not observe and practice the law of your God and the law of the king, let judgment be executed upon him strictly and promptly, whether it be for death or banishment or confiscation of property or imprisonment.”

Therefore let us now make a covenant with our God to send away all the [foreign] wives and their children, in accordance with the advice of my lord and of those who tremble [in reverent obedience] at the commandment of our God; and let it be done in accordance with the Law.

Then Ezra got up from before the house of God and went into the chamber of Jehohanan the son of Eliashib [and spent the night there]. He did not eat bread nor drink water, for he was mourning over the [former] exiles’ faithlessness.