Numbers 18:14-19

Everything placed under the ban (Numbers 18:14), and the first-born of man and beast that the people redeemed or offered (Numbers 18:15-18), were "holy" offerings (Numbers 18:10; Numbers 18:19). The "everlasting covenant of salt" (Numbers 18:19) was an indestructible covenant similar to salt (cf. 2 Chronicles 13:5). The ancients used salt in the ritual of making some covenants in the Near East.

"At a meal in which a covenant between two parties was sealed, people in ancient times occasionally used salt to signify the incorruptible, firm, and lasting quality of the agreement." [Note: Maarsingh, p. 65.]

"The meaning appears to have been that the salt, with its power to strengthen food and keep it from decay, symbolized the unbending truthfulness of that self-surrender to the Lord embodied in the sacrifice, by which all impurity and hypocrisy were repelled." [Note: Unger’s Bible Dictionary, 1957 ed., s.v. "Covenant of Salt."]

God gave the priests five gifts: their office, a spirit of responsibility, helpers, every provision for earthly needs, and Himself. [Note: Jensen, pp. 78-79.]