Leviticus 2:13

With all thine offerings thou shalt offer salt - Not only every מנחה mı̂nchāh, but every animal offering was to be accompanied by salt. It was the one symbol which was never absent from the altar of burnt-offering, showing the imperishablness of the love of Yahweh for His people. In its unalterable nature, it is the contrary of leaven (yeast). The Arabs are said to retain in common use the expression, “a covenant of salt;” and the respect they pay to bread and salt in their rites of hospitality is well known.