Reference for Pesachim 112:4
א"ל רבא והא מוקצות נינהו וכי תימא הואיל דחזי לעורבין השתא מוכן לאדם לא הוי מוכן לכלבים דתנן ר' יהודה אומר אם לא היתה נבילה מע"ש אסורה לפי שאינה מן המוכן מוכן לעורבים הוי מוכן לאדם
Said Rabbah to him, But they are mukzeh?<span class="x" onmousemove="('comment',' v. Glos. Rashi: on the eve of the Sabbath or Festival at twilight they were mukzeh on account of the prohibition of cutting them off then from the tree, and consequently they remain so for the whole day, even after they fall. (Mukzeh is always determined by the status of an object at twilight of the Sabbath or Festival.) Tosaf.: they were mukzeh at twilight because one must not make use of a tree on the Sabbath or Festival, e.g., by climbing it, taking articles which had been suspended upon it, etc.');"><sup>4</sup></span> And should you say, [that is] because they [the dates] were fit for [his] ravens,<span class="x" onmousemove="('comment',' If he has ravens at home, they could have eaten these dates on the Sabbath even while they were still on the tree; since they are fit for his birds, they are also regarded as fit for himself too.');"><sup>5</sup></span> [I would rejoin], - seeing that that which is ready<span class="x" onmousemove="('comment',' Mukan, a technical term denoting the opposite of mukzeh.');"><sup>6</sup></span>