Commentary for Shabbat 47:6

אמר אביי לרב יוסף הא דרב הונא ורב יהודה דרב הוא דאמר רב גידל אמר רב ראש חדש שחל להיות בשבת המפטיר בנביא בשבת אינו צריך להזכיר של ראש חדש שאילמלא שבת אין נביא בראש חדש

— at the Evening, Morning and Afternoon [Services] the Eighteen [Benedictions] are recited, and the nature of the occasion is inserted in 'Thou hearkenst unto Prayer';<span class="x" onmousemove="('comment',' The name of the sixteenth Benediction. ');">²⁰</span> yet if one does not insert it he is not made to repeat it,<span class="x" onmousemove="('comment',' Because these are not Biblical institutions. ');">²¹</span> and no reference is made on these [days] in grace after meals.<span class="x" onmousemove="('comment',' The first clause states that a reference is made on New Moon, in agreement with Rab. ');">²²</span> The scholars propounded: Should one refer to Hanukkah in the Additional Services?<span class="x" onmousemove="('comment',' Of the Sabbath and New Moon; these always occur during Hanukkah, which commences on the 25th of the month and lasts eight days. ');">²³</span>

Rashi on Shabbat