וְכָל־קָרְבַּ֣ן מִנְחָתְךָ֮ בַּמֶּ֣לַח תִּמְלָח֒ וְלֹ֣א תַשְׁבִּ֗ית מֶ֚לַח בְּרִ֣ית אֱלֹהֶ֔יךָ מֵעַ֖ל מִנְחָתֶ֑ךָ עַ֥ל כָּל־קָרְבָּנְךָ֖ תַּקְרִ֥יב מֶֽלַח׃ (ס)
И всякую пищу твою приправляй солью; и ты не будешь страдать от соли завета Бога твоего, которого не хватает в жертве твоей пищи; со всеми приношениями твоими ты будешь приносить соль.
Kitzur Shulchan Arukh
It is a mitzvah to have salt on the table before breaking the bread and to dip the piece of bread over which Hamotzi was said, into the salt. The reason for this is that the table is compared to the Altar [in the Holy Temple] and the food symbolizes the offering, and it is said (Leviticus 2:13): "On all your offerings you shall offer salt." And because the table is compared to the Altar, it is best to take care not to kill any vermin [or other insects] on it.
Mishneh Torah, Positive Mitzvot
That every sacrifice be salted, as it is said, “With all thine offerings thou shalt offer salt” (Lev. 2:13).
Mishneh Torah, Negative Mitzvot
Not to inflict a blemish on cattle set apart for sacrifice, as it is said, “There shall be no blemish therein” (Lev. 22:21). This means, “Thou shalt not cause a blemish in it.”