Numbers 18:19-21

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.”

Duties of the Levites

18:20 The Lord spoke to Aaron, “You will have no inheritance in their land, nor will you have any portion of property ²  among them – I am your portion and your inheritance among the Israelites. 18:21 See, I have given the Levites all the tithes in Israel for an inheritance, for their service which they perform – the service of the tent of meeting.

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.

² tn The phrase “of property” is supplied as a clarification.