Covenant of the Levites
Source: Nav
Nehemiah 13:29
Remember them, O my God, because they have defiled the priesthood and the covenant of the priesthood and of the Levites.
Malachi 2:4, 5
Then you will know that I have sent you this commandment so that My covenant with Levi may continue,” says the LORD of Hosts. / “My covenant with him was one of life and peace, which I gave to him; it called for reverence, and he revered Me and stood in awe of My name.