Malachi 2:7-9

7For a kohen’s lips should guard knowledge, and instruction must be sought from his mouth. For he is a messenger of Adonai-Tzva’ot.

8But you have turned from the way. You caused many to stumble in Torah by the instruction, You corrupted the covenant of the Levites,” —says Adonai-Tzva’ot.

9“So I also have made you despised and lowly to all the people, because you are not keeping My ways but show favoritism in Torah.”