Leviticus 2:13 13 And every oblation of thy meat offering shalt thou season with salt; neither shalt thou suffer the salt of the covenant of thy God to be lacking from thy meat offering: with all thine offerings thou shalt offer salt.
According to the Bible Knowledge Commentary, “salt was regarded in the ancient Near East as not being destructible by fire.” So when salt was included in all the offerings on the altar, it symbolised the indestructible covenant relationship Israel had with God.
Numbers 18:19 All the heave offerings of the holy things, which the children of Israel offer unto the Lord, have I given thee, and thy sons and thy daughters with thee, by a statute for ever: it is a covenant of salt for ever before the Lord unto thee and to thy seed with thee.
2 Chronicles 13:5 Ought ye not to know that the Lord God of Israel gave the kingdom over Israel to David for ever, even to him and to his sons by a covenant of salt?
The lesson we can take from this is that God wants us to know that when He gives His Word, He keeps it. His promises are indestructible. His covenant with Israel was unbreakable, and His covenant with all those who believe on Christ is indestructible as well!