Answers (2)
The Greek word di·a·the′ke is variously rendered “covenant,” “will,” or testament, they are all the same thing.
Covenants always involved two or more parties. They could be unilateral (where the party on one side was solely responsible to carry out the terms) or bilateral (where parties on both sides had terms to carry out).
Besides the covenants in which God is a party, the Bible records the making of covenants between men, and between tribes, nations, or groups of persons.
The term “covenant” is applied to a sure ordinance, such as that concerning the showbread (Le 24:8), or to God’s creation governed by his laws, as the unchangeable succession of day and night (Jer 33:20); it is also used figuratively, as in the expression “covenant with Death.” (Isa 28:18)
God also speaks of a covenant in connection with the wild beasts. (Ho 2:18) The marriage compact is called a covenant. (Mal 2:14) The expression “owners (masters) of the covenant” has the sense of “confederates,” as at Genesis 14:13.
In effect, any promise made by Jehovah is a covenant; it is certain to be carried out; it can be relied on with confidence for its fulfillment. (Heb 6:18)
A covenant is in force as long as the terms of it are operative and the obligation to perform rests on one or both parties. The results or the blessings brought about by the covenant may continue, even forever.
Here are some important covenant (testaments):
Law covenant (Old Testament)
New covenant (New Testament)
Covenant with the tribe of Levi
Covenant with the Israel at Moab
Covenant with King David
Covenant to Be a Priest Like Melchizedek
Jesus’ Covenant With His Followers
Just to mention a few of them.