In what things may they cover up [food], and in what things may they not cover it up?They may not cover up [food] in peat, compost, salt, lime, or sand, whether moist or dry; Nor in straw, grape-skins, rags or grasses, when they are moist; but they may cover up [food] in them when they are dry. They may cover up [food] in garments, produce, doves’ wings, carpenters’ sawdust and thoroughly beaten flax. Rabbi Judah forbids [storing] in fine [flax], but permits [it] in coarse [flax]. They may cover up [food] with hides, and they may be handled; [They may cover up food] with wool shearings, but they may not be handled. What then is done? The lid [of the pot] is lifted, and they [the shearings] fall off of their own accord. Rabbi Elazar ben Azariah says: the basket [holding the pot] he turns on its side and [the food] is removed, lest one lift [the lid of the pot] and is unable to replace it. But the Sages say: one may take [out the pot] and replace [it]. If he did not cover it [a pot] while it was yet day, it may not be covered after nightfall. If it was covered but became uncovered, it may be recovered. One may fill a jug with [cold water] and place it under a pillow or blanket [to keep it cool].
Mishnah Shabbat 4
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