Reference for Shabbat 89:1

הכי נמי מיסתברא דרב כר' יהודה סבירא ליה דאמר רב מניחין נר על גבי דקל בשבת ואין מניחין נר ע"ג דקל בי"ט אי אמרת בשלמא דרב כרבי יהודה סבירא ליה היינו דשני בין שבת לי"ט אלא אי אמרת כרבי שמעון סבירא ליה מה לי שבת ומה לי י"ט

Logic too avers that Rab agrees with R. Judah. For Rab said: A lamp may be placed on a palm tree for the Sabbath,<span class="x" onmousemove="('comment',' I.e., before the Sabbath, that it should burn during the Sabbath. There is no fear that he will take and use it if it goes out, thereby technically making use of what is attached to the soil. For since it was mukzeh at twilight it may not be used for the whole of the Sabbath. ');">¹</span> but not on a Festival.<span class="x" onmousemove="('comment',' For then one may remove it from the tree, replace it, and so on, thus making use of the tree itself, which is prohibited. ');">²</span> Now, it is well if you admit that Rab holds as R. Judah: hence he draws a distinction between the Sabbath and Festivals.<span class="x" onmousemove="('comment',' He will not remove it from the tree on the Sabbath, because of the interdict of mukzeh, which in this respect does not operate on Festivals. ');">³</span>

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