Remember them, O my God, because they have defiled the priesthood, and the covenant of the priesthood, and of the Levites. (13:29)

--Malachi--

And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith the Lord of hosts. (2:4)

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. (2:5)