Reference for Eruvin 80:4

ובמוספין מתחיל בשל שבת ומסיים בשל שבת ואומר קדושת היום באמצע

In the additional prayers one must begin and conclude with the mention of the Sabbath<span class="x" onmousemove="('comment',' Beginning 'And Thou hast given us this day of rest' and concluding with 'Who sanctifies the Sabbath'.');">¹¹</span> inserting the mention of the sanctity of the day in the middle [of the benediction only].<span class="x" onmousemove="('comment',' Thus only in the case of the additional prayers is the mention of the New Moon included at least in the middle of the benediction on the sanctity of the day. In the case of the morning and evening prayers, however, it is not mentioned even in the middle but, as on a weekday, the tchu vkgh mention of the New Moon is restricted to the special New Moon prayer beginning, 'Our God . . may our remembrance rise' () which is inserted in the benediction on the Temple service (cf. P.B. p. 50) .');">¹²</span> R'Simeon B'Gamaliel and R'Ishmael son of R'Johanan B'Beroka ruled: Wherever one is under an obligation to recite seven benedictions<span class="x" onmousemove="('comment',' I,e., even in the evening and morning prayers when a New Moon or a festival falls on a Sabbath.');">¹³</span> it is necessary to begin and conclude with the mention of the Sabbath<span class="x" onmousemove="('comment',' Beginning 'And Thou hast given us this day of rest' and concluding with 'Who sanctifies the Sabbath'.');">¹¹</span>

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