'Salt' in the Bible

All the raised offerings of the holy things that the Israelites offer to the Lord, I have given to you, and to your sons and daughters with you, as a perpetual ordinance. It is a covenant of salt forever before the Lord for you and for your descendants with you."

your southern border will extend from the wilderness of Zin along the Edomite border, and your southern border will run eastward to the extremity of the Salt Sea,

Then the border will continue down the Jordan River and its direction will be to the Salt Sea. This will be your land by its borders that surround it.'"