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Covenant - a contract or agreement between two parties. In the Old Testament the Hebrew word berith is always thus translated. Berith is derived from a root which means "to cut," and hence a covenant is a "cutting," with reference to the cutting or dividing of animals into two parts, and the contracting parties passing between them, in making a covenant (Gen. 15; Jer. 34:18, 19).
The corresponding word in the New Testament Greek is diatheke, which is, however, rendered "testament" generally in the Authorized Version. It ought to be rendered, just as the word berith of the Old Testament, "covenant."

This word is used (1) of a covenant or compact between man and man (Gen. 21:32), or between tribes or nations (1 Sam. 11:1; Josh. 9:6, 15). In entering into a convenant, Jehovah was solemnly called on to witness the transaction (Gen. 31:50), and hence it was called a "covenant of the Lord" (1 Sam. 20:8). The marriage compact is called "the covenant of God" (Prov. 2:17), because the marriage was made in God's name. Wicked men are spoken of as acting as if they had made a "covenant with death" not to destroy them, or with hell not to devour them (Isa. 28:15, 18).

(2.) The word is used with reference to God's revelation of himself in the way of promise or of favour to men. Thus God's promise to Noah after the Flood is called a covenant (Gen. 9; Jer. 33:20, "my covenant"). We have an account of God's covernant with Abraham (Gen. 17, comp. Lev. 26:42), of the covenant of the priesthood (Num. 25:12, 13; Deut. 33:9; Neh. 13:29), and of the covenant of Sinai (Ex. 34:27, 28; Lev. 26:15), which was afterwards renewed at different times in the history of Israel (Deut. 29; Josh. 1:24; 2 Chr. 15; 23; 29; 34; Ezra 10; Neh. 9). In conformity with human custom, God's covenant is said to be confirmed with an oath (Deut. 4:31; Ps. 89:3), and to be accompanied by a sign (Gen. 9; 17). Hence the covenant is called God's "counsel," "oath," "promise" (Ps. 89:3, 4; 105:8-11; Heb. 6:13-20; Luke 1:68-75). God's covenant consists wholly in the bestowal of blessing (Isa. 59:21; Jer. 31:33, 34).

The term covenant is also used to designate the regular succession of day and night (Jer. 33:20), the Sabbath (Ex. 31:16), circumcision (Gen. 17:9, 10), and in general any ordinance of God (Jer. 34:13, 14).

A "covenant of salt" signifies an everlasting covenant, in the sealing or ratifying of which salt, as an emblem of perpetuity, is used (Num. 18:19; Lev. 2:13; 2 Chr. 13:5).

SOURCE: Easton's Bible Dictionary