'Covenant' in the Bible

And ye shall know that I have sent this commandment unto you, that my covenant may be with Levi, saith Jehovah of hosts.

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

But ye are turned aside out of the way; ye have caused many to stumble in the law; ye have corrupted the covenant of Levi, saith Jehovah of hosts.

Have we not all one father? hath not one God created us? why do we deal treacherously every man against his brother, profaning the covenant of our fathers?

Yet ye say, Wherefore? Because Jehovah hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously, though she is thy companion, and the wife of thy covenant.

Behold, I send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, will suddenly come to his temple; and the messenger of the covenant, whom ye desire, behold, he cometh, saith Jehovah of hosts.