And every oblation of your meat offering shall you season with salt…
Eating salt together is in the East a pledge of amity and friendship. Hence the "covenant of salt" was an indissoluble pact; and "salted with the salt of the palace" (Ezra 4:14) meant not maintenance, but the sign of faithfulness to the king. Salt was used in the sacrifices and offerings of the Israelites, probably with the same idea of honour and fidelity.
Parallel VersesKJV: 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.
WEB: Every offering of your meal offering you shall season with salt; neither shall you allow the salt of the covenant of your God to be lacking from your meal offering. With all your offerings you shall offer salt.