Reference for Shabbat 252:13

אבל לא את הטבל ולא את מעשר [ראשון] שלא נטלה תרומתו ולא את מעשר שני והקדש שלא נפדו ולא את הלוף ולא את החרדל ר' שמעון בן גמליאל מתיר בלוף מפני שהוא מאכל עורבין

<b><i>MISHNAH</i></b>. ALL LIDS OF UTENSILS WHICH HAVE A HANDLE MAY BE HANDLED ON THE SABBATH. SAID R. JOSE, WHEN IS THAT SAID? IN THE CASE OF LIDS OF GROUND [BUILDINGS],<span class="x" onmousemove="('comment',' E.g., the lid or cover of a pit built in the ground. When they have a handle they are obviously not part of the pit and are meant to be put on and taken off. But otherwise they seem to be there permanently: hence placing them there is like building, and removing them is like demolishing. ');">¹³</span>

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