Malachi 2:4-7

And you will know that I have sent you this warning so that my covenant with Levi may continue,” says the LORD Almighty. “My covenant was with him, a covenant of life and peace, and I gave them to him; this called for reverence and he revered me and stood in awe of my name. True instruction was in his mouth and nothing false was found on his lips. He walked with me in peace and uprightness, and turned many from sin. “For the lips of a priest ought to preserve knowledge, because he is the messenger of the LORD Almighty and people seek instruction from his mouth.