This fundamental mishna enumerates those who perform the primary categories of labor prohibited on Shabbat, which number forty-less-one. They are grouped in accordance with their function: One who sows, and one who plows, and one who reaps, and one who gathers sheaves into a pile, and one who threshes, removing the kernel from the husk, and one who winnows threshed grain in the wind, and one who selects the inedible waste from the edible, and one who grinds, and one who sifts the flour in a sieve, and one who kneads dough, and one who bakes. Additional primary categories of prohibited labor are the following: One who shears wool, and one who whitens it, and one who combs the fleece and straightens it, and one who dyes it, and one who spins the wool, and one who stretches the threads of the warp in the loom, and one who constructs two meshes, tying the threads of the warp to the base of the loom, and one who weaves two threads, and one who severs two threads for constructive purposes, and one who ties a knot, and one who unties a knot, and one who sews two stitches with a needle, as well as one who tears a fabric in order to sew two stitches.One who traps a deer, or any living creature, and one who slaughters it, and one who flays it, and one who salts its hide, a step in the tanning process, and one who tans its hide, and one who smooths it, removing hairs and veins, and one who cuts it into measured parts. One who writes two letters and one who erases in order to write two letters. One who builds a structure, and one who dismantles it, one who extinguishes a fire, and one who kindles a fire. One who strikes a blow with a hammer to complete the production process of a vessel (Rabbeinu Ḥananel), and one who carries out an object from domain to domain. All these are primary categories of labor, and they number forty-less-one.

That which we learned in the Mishnah: The primary categories of labor [melachot], which are prohibited by Torah law on Shabbat, are forty-less-one; to what does this number correspond?

Rabbi Ḥanina bar Ḥama said to them: They correspond to the labors in the Tabernacle. Rabbi Yonatan, son of Rabbi Elazar, said to them that thus said Rabbi Shimon, son of Rabbi Yosei ben Lakonya: "They correspond to the instances of the words 'labor' [melacha], 'his labor' [melachto], and 'the labor of' [melechet], that appear in the Torah a total of forty-less-one times."

Additional primary categories of prohibited labor are the following: One who shears wool, and one who whitens it, and one who combs the fleece and straightens it, and one who dyes it, and one who spins the wool, and one who stretches the threads of the warp in the loom, and one who constructs two meshes, tying the threads of the warp to the base of the loom, and one who weaves two threads, and one who severs two threads for constructive purposes, and one who ties a knot, and one who unties a knot, and one who sews two stitches with a needle, as well as one who tears a fabric in order to sew two stitches.

As for the tabernacle, make it of ten strips of cloth; make these of fine twisted linen, of blue, purple, and crimson yarns, with a design of cherubim worked into them.

שש משזר ותכלת וארגמן ותלעת שני OF FINE TWINED LINEN AND BLUE PURPLE, AND RED PURPLE, AND CRIMSON — Thus there were four different materials in every thread, one of linen and three of wool, each of the strands of which a thread was composed being sixfold (the word is taken here in the double sense of שש “linen” and of שש “six”). Consequently the four materials intertwined into one thread gave a twenty-four-fold thread (Yoma 71b; Baraita DeMelekhet HaMishkan ch. 2).