Malachi 2:4-7

4And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith Jehovah of hosts.

5My covenant with him was of life and peace, and I gave them to him that he might fear; and he feared me, and trembled before my name.

6The law of truth was in his mouth, and unrighteousness was not found in his lips: he walked with me in peace and uprightness, and he turned many from iniquity.

7For the priest's lips should keep knowledge, and at his mouth they seek the law; for he is the messenger of Jehovah of hosts.