Covenant of Salt, Hebrew, b’rith melah, is a ritual or custom conducted between covenanting parties (Numbers 18:19; 2 Chronicles 13:5). The possible meaning seemed to be that the salt, with its power to strengthen food and keep it from decaying, symbolized the unbending truthfulness of self-surrender to the Lord embodied in the sacrifice, by which all impurity and hypocrisy was repelled. A.G.H.
Unger, Merrill F., Unger’s Bible Dictionary, Chicago, Moody Press, 1966, pp. 224