A Covenant is an agreement between two contracting parties, originally sealed with blood; a bond, or a law; a permanent religious dispensation. The old, primitive way of concluding a covenant (, “to cut a covenant”) was for the covenanters to cut into each other’s arm and suck the blood, the mixing of the blood rendering them “brothers of the covenant” (see Trumbull, “The Blood Covenant,” pp. 5). The word “berit” is to be derived from “barah” =to cut. A rite expressive of the same idea is (see Jer 34:18; compare Gen 15) the cutting of a sacrificial animal into two parts, between which the contracting parties pass, showing thereby that they are bound to each other; the eating together of the meat, which usually follows, reiterating the same idea. Originally the covenant was a bond of life-fellowship, where the mingling of the blood was deemed essential. In the course of time aversion to imbibing human blood eliminated the sucking of the blood, and the eating and drinking together became in itself the means of covenanting, while the act was solemnized by the invocation of the Deity in an oath, or by the presence of representative symbols of the Deity, such as seven animals, or seven stones or wells, indicative of the seven astral deities; whence (“to be bound by the holy seven”) as an equivalent for “swearing” in pre-Mosaic times (see Gen 21:27, Gen 26:28, Gen 31:54; Josh 9:14; 2 Sam 3:12–20). Salt was especially selected together with bread for the conclusion of a covenant (Num 18:19; see W. R. Smith, l.c. p. 252; Trumbull, “The Covenant of Salt,” 1899).
Modified from, Covenant – The Jewish Encyclopedia