Malachi 2:6-7

2:6 He taught what was true; sinful words were not found on his lips. He walked with me in peace and integrity, and he turned many people away from sin. 2:7 For the lips of a priest should preserve knowledge of sacred things, and people should seek instruction from him because he is the messenger of the Lord who rules over all.

Malachi 2:9

2:9 “Therefore, I have caused you to be ignored and belittled before all people to the extent to which you are not following after me and are showing partiality in your instruction.”