Malachi 2:7-9

For the lips of the priest should guard and preserve knowledge [of My law], and the people should seek instruction from his mouth; for he is the messenger of the LORD of hosts. But as for you [priests], you have turned from the way and you have caused many to stumble by your instruction [in the law]. You have violated the covenant of Levi,” says the LORD of hosts. “So I have also made you despised and abased before all the people, just as you are not keeping My ways but are showing partiality [to people] in [your administration of] the law.”