Reference for Shabbat 85:13

ת"ש פורסין מחצלות על גבי לבנים בשבת דאישתיור מבנינא דחזיין למיזגא עלייהו

R. Isaac said: just as a vessel may not be placed under a fowl to receive her eggs, so may a vessel not be overturned upon it [the egg] that it should not be broken. He holds that a vessel may be handled only for the sake of that which itself may be handled on the Sabbath.<span class="x" onmousemove="('comment',' Which excludes an egg laid on the Sabbath. ');">¹²</span>

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