Reference for Shabbat 99:16

והתניא נתר וחול אסור מאי לאו בהא קמיפלגי דמר סבר בעינן מעשה ומר סבר לא בעינן מעשה

but if it is fodder for animals, or a pillow or a sheet was upon it before nightfall,<span class="x" onmousemove="('comment',' Lit., 'by day'-i.e., if one had lain upon it before the Sabbath, though he had neither put aside the straw nor declared his intention to use it as a mattress. ');">¹⁴</span>

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