Reference for Shabbat 20:5
הַקַּשׁ שֶׁעַל גַּבֵּי הַמִּטָּה, לֹא יְנַעְנְעוֹ בְיָדוֹ, אֶלָּא מְנַעְנְעוֹ בְגוּפוֹ. וְאִם הָיָה מַאֲכַל בְּהֵמָה, אוֹ שֶׁהָיָה עָלָיו כַּר אוֹ סָדִין, מְנַעְנְעוֹ בְיָדוֹ. מַכְבֵּשׁ שֶׁל בַּעֲלֵי בָתִּים, מַתִּירִין, אֲבָל לֹא כוֹבְשִׁין. וְשֶׁל כּוֹבְסִין, לֹא יִגַּע בּוֹ. רַבִּי יְהוּדָה אוֹמֵר, אִם הָיָה מֻתָּר מֵעֶרֶב שַׁבָּת, מַתִּיר אֶת כֻּלּוֹ וְשׁוֹמְטוֹ:
Straw on a bed [is generally used as fuel, so that if one wishes to move it around so that it be soft and comfortable for sleeping upon], he should not move it with his hand, [for it is muktzeh], but he should move it with his body, [with his shoulders, for this is "moving from the side," which is not regarded as (interdicted) moving.] But if it had been designated as animal food, or if there were a mattress or a sheet on it, [in which instance it is clear that the straw had been placed there for lying upon, its status is that of a (movable) item, and], he may move it with his hand. A home clothes press — it is permitted to remove [clothing from it for Sabbath use], but not to press [clothing thereon, this being a weekday function]; and a washerman's clothes press — it may not be touched. [For it is used to straighten clothing and is pressed down very tightly, so that removing clothing therefrom is like stirah ("razing")]. R. Yehudah says: If it were (partially) opened from Sabbath eve, he may open the whole and take it (his clothing) out. [The halachah is not in accordance with R. Yehudah.]