'Covenant of the Lord' in the Bible

Take heed to yourselves, lest ye forget the covenant of the LORD your God, which he made with you, and make you a graven image, or the likeness of any thing which the LORD thy God hath forbidden thee.

At that time the LORD separated the tribe of Levi, to bear the ark of the covenant of the LORD, to stand before the LORD to minister to him, and to bless in his name, to this day.

Then men shall say, Because they have forsaken the covenant of the LORD God of their fathers, which he made with them when he brought them forth from the land of Egypt:

And Moses wrote this law, and delivered it to the priests the sons of Levi, who bore the ark of the covenant of the LORD, and to all the elders of Israel.

That Moses commanded the Levites who bore the ark of the covenant of the LORD, saying,

Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.