'Covenant' in the Bible

Then you will know [without any doubt] that I have sent this [new] commandment to you (priests), that My covenant may continue with Levi [the priestly tribe],” says the Lord of hosts.

“My covenant with Levi was [one of] life and peace, and I gave them to him as an object of reverence; so he [and the priests] feared Me and stood in reverent awe of My name.

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.

Do we not all have one Father? Has not one God created us? Why do we deal treacherously with one another, profaning the covenant of our fathers [with God]?

But you say, “Why [does He reject it]?” Because the Lord has been a witness between you and the wife of your youth, against whom you have dealt treacherously. Yet she is your marriage companion and the wife of your covenant [made by your vows].

“Behold, I am going to send My messenger, and he will prepare and clear the way before Me. And the Lord [the Messiah], whom you seek, will suddenly come to His temple; the Messenger of the covenant, in whom you delight, behold, He is coming,” says the Lord of hosts.