Bilangan 18:19

18:19 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 ¹  forever before the Lord for you and for your descendants with you.”

Bilangan 19:9

19:9 “‘Then a man who is ceremonially clean must gather up the ashes of the red heifer and put them in a ceremonially clean place outside the camp. They must be kept ²  for the community of the Israelites for use in the water of purification ³  – it is a purification for sin. ⁴ 

[18:19]  ¹ sn Salt was used in all the offerings; its importance as a preservative made it a natural symbol for the covenant which was established by sacrifice. Even general agreements were attested by sacrifice, and the phrase “covenant of salt” speaks of such agreements as binding and irrevocable. Note the expression in Ezra 4:14, “we have been salted with the salt of the palace.” See further J. F. Ross, IDB 4:167.

[19:9]  ² tn Heb “it will be.”

[19:9]  ³ tn The expression לְמֵי נִדָּה (lÿme niddah) is “for waters of impurity.” The genitive must designate the purpose of the waters – they are for cases of impurity, and so serve for cleansing or purifying, thus “water of purification.” The word “impurity” can also mean “abhorrent” because it refers to so many kinds of impurities. It is also called a purification offering; Milgrom notes that this is fitting because the sacrificial ritual involved transfers impurity from the purified to the purifier (pp. 62-72).

[19:9]  ⁴ sn The ashes were to be stored somewhere outside the camp to be used in a water portion for cleansing someone who was defiled. This is a ritual that was enacted in the wilderness; it is something of a restoring rite for people alienated from community.