'Covenant' in the Bible

You will know that I have sent this commandment to you, that my covenant may be with Levi," says Yahweh of Armies.

"My covenant was with him of life and peace; and I gave them to him that he might be reverent toward me; and he was reverent toward me, and stood in awe of my name.

But you have turned aside out of the way. You have caused many to stumble in the law. You have corrupted the covenant of Levi," says Yahweh of Armies.

Don't we all have one father? Hasn't one God created us? Why do we deal treacherously every man against his brother, profaning the covenant of our fathers?

Yet you say, 'Why?' Because Yahweh has been witness between you and the wife of your youth, against whom you have dealt treacherously, though she is your companion, and the wife of your covenant.

"Behold, I send my messenger, and he will prepare the way before me; and the Lord, whom you seek, will suddenly come to his temple; and the messenger of the covenant, whom you desire, behold, he comes!" says Yahweh of Armies.