Reference for Eruvin 157:12

ולא יתן לתוך קופתו תבן והתניא בית שבין שתי חצירות ומילאהו תבן מערבין שנים ואין מערבין אחד זה נותן לתוך קופתו ויאכיל וזה נותן לתוך קופתו ויאכיל נתמעט התבן מי' טפחים שניהם אסורים

there;<span class="x" onmousemove="('comment',' Though the straw is mukzeh and there is the possibility of forgetting and picking it lip with the hands which is forbidden.');">³⁸</span> but did not R'Huna lay down in the name of R'Hanina: A man may put his beast on a stretch of grass<span class="x" onmousemove="('comment',' Lit., 'grasses'.');">³⁹</span> on the Sabbath day<span class="x" onmousemove="('comment',' And, since a man is careful in the observance of Sabbath prohibitions, there is no need to provide against the possibility of his plucking the grass forgetfully on the Sabbath.');">⁴⁰</span> but not upon mukzeh?<span class="x" onmousemove="('comment',' Shab. 122a. Since the law of mukzeh, being only Rabbinical, is one of a minor character the man might lightly forget it and so pick the mukzeh up with his own hands on the Sabbath, an act which is forbidden. Now since R. Huna forbids the putting of a beast upon mukzeh, how could he, according to his interpretation of our Mishnah, allow a beast to be put immediately in front of the straw heap which is definitely mukzeh?');">⁴¹</span>

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