Behold, I am sending my messenger, and he will make a turning back to the way, before Me.
Suddenly the Lord God Yehovah whom ye seek will enter into his temple.
The messenger of the covenant, in which ye delight, behold, he is here, says Yehovah, God of hosts.
And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith Yehovah, God of hosts. My covenant was with him of life and peace; and I gave them to him for the fear wherewith he feared me, and was afraid before my name. The law of truth was in his mouth, and iniquity was not found in his lips: he walked with me in peace and equity, and did turn many away from iniquity. For the priest’s lips should keep knowledge, and they should seek the law at his mouth: for he is the messenger of Yehovah, God of hosts.
And risen to ye who fear My name, Hath the sun of righteousness — and healing in its wings
2Malachi.com