John Gill Commentary Leviticus 2:13

"And every oblation of thy meal-offering shalt thou season with salt; neither shalt thou suffer the salt of the covenant of thy God to be lacking from thy meal-offering: with all thine oblations thou shalt offer salt." — Leviticus 2:13 (ASV)

And every oblation of your meat offering you shall season
with salt
Which makes food savoury, and preserves from putrefaction; denoting the savouriness and acceptableness of Christ as a meat offering to his people, he being savoury food, such as their souls love, as well as to God the Father, who is well pleased with his sacrifice; and also the perpetuity of his sacrifice, which always has the same virtue in it, and of him as a meat offering, who is that meat which endures to everlasting life, (John 6:27) and also the grave and gracious conversation of those that by faith feed upon him, (Mark 9:50) (Colossians 4:6)

neither shall you suffer the salt of the covenant of your God to be
lacking from your meat offering ;
this seems to suggest the reason why salt was used in meat offerings, and in all others, because it was a symbol of the perpetuity of the covenant, which from which is called a covenant of salt, (Numbers 18:19) namely, the covenant of the priesthood, to which these sacrifices belonged, (Numbers 25:13) hence the Targum of Jonathan, ``because the twenty four gifts of the priests are decreed by the covenant of salt, therefore upon all your offerings you shall offer salt:''

with all your offerings you shall offer salt ,
even those that were not to be eaten, as well as those that were; as the burnt offering of the herd, of the flock, and of fowls, and their several parts; all were obliged to be salted that were offered, excepting wine, blood, wood, and incense ^F24 ; hence there was a room in the temple where salt was laid up for this purpose, called (xlm tkvl) , "the salt room" ^F25 ; and which was provided by the congregation, and not by a private person {z}; our Lord has reference to this law in (Mark 9:49) the Heathens always made use of salt in their sacrifices ^F1 .

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FOOTNOTES:

• F24: Maimon. Issure Mizbeach, c. 5. sect. 11.
• F25: Misn. Middot, c. 5. sect. 2.
• F1: Ante Deos Homini Ovid. Fastor. l. 1. Vid. Horat. Carmin. l. 3. Ode 23.