'Covenant' in the Bible

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

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

But ye are departed out of the way; ye have caused many to stumble at 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 unfaithfully every man against his brother, by profaning the covenant of our fathers?

Yet ye say, Wherefore? Because Jehovah hath been a witness between thee and the wife of thy youth, against whom thou hast dealt unfaithfully: yet is she 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 Angel of the covenant, whom ye delight in: behold, he cometh, saith Jehovah of hosts.