Reference for Menachot 89:18

חודש אם חדשו ואמרו חלב מותר מאיש שוגה ומפתי מלמד שאין חייבין אלא על העלם דבר עם שגגת מעשה

just as it was offered in the time of Moses.<span class="x" onmousemove="('comment',' For on the eighth day of the consecration of the Sanctuary in the time of Moses, which coincided with the New Moon of Nisan, sin-offerings, and not the usual burnt-offerings, were brought. The prophet Ezekiel foretells a similar consecration of the Temple on the New Moon in the future, when in place of the usual burnt-offerings sin-offerings will be offered.');">¹⁸</span> There has also been taught [a Baraitha] to the same effect: R'Judah says, This passage will be interpreted by Elijah in the future.

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