Reference for Shabbat 227:12
כשתמצא לומר לדברי רבי ישמעאל נדרים ונדבות קריבין ביו"ט וכי איצטריך קרא ליוה"כ לדברי ר"ע נדרים ונדבות אין קרבין ביו"ט וכי איצטריך קרא למישרא בי"ט אמר ר' זירא
One might think, On the Day of Atonement too, therefore it is stated, 'on the Sabbath thereof.' When you examine the matter,<span class="x" onmousemove="('comment',' Lit., 'when you find to say', ');"><sup>32</sup></span> according to R. Ishmael's opinion, vows<span class="x" onmousemove="('comment',' I.e. vowed sacrifices, ');"><sup>33</sup></span> and freewill-offerinqs<span class="x" onmousemove="('comment',' For the difference v, R. H. 6a. Both, of course, are voluntary sacrifices, ');"><sup>34</sup></span> may be sacrificed on a Festival, hence the verse is required in respect of the Day of Atonement.<span class="x" onmousemove="('comment',' For if even voluntary offerings. which can be brought on weekdays, may be sacrificed on a Festival, it goes without saying that fats left over from the obligatory public sacrifices of the Sabbath can be burnt in the evening, even if it is a Festival, and no verse is necessary to teach this. Consequently the verse must be referred to the Day of Atonement, ');"><sup>35</sup></span> [But] on the view of R. Akiba, vows and freewill-offerings cannot be sacrificed on a Festival; hence the verse is required to permit [the burning of the fats on] Festivals. R. Zera said: