תלמוד על שבת 3:1

MISHNAH: In what does one store away and in what may one not store away¹To keep food warm for the Sabbath meal one prepares a big box which is padded with insulating material in which the hot pots will be embedded. In German this used to be called “Kochkiste.” The insulating material may not be anything which in a fermentation process will produce heat.? One does not store away in olive cake²Chapter 3, Note 3., nor in manure, nor in salt, nor in lime, nor in sand, whether moist or dry. Not in straw, nor in fibers, nor in grape pits, nor in grasses when they are moist³And produce heat in rotting. but one may store away in them when dry. One may store away in garments, and produce, and pigeon wings⁴Down., and flax residue, and in fine sawdust. Rebbi Jehudah forbids if it is fine and permits coarse.