Reference for Rosh Hashanah 16:1
שהחדש מתכסה בו הוי אומר זה ר"ה וכתיב (תהלים פא, ה) כי חק לישראל הוא משפט לאלהי יעקב
on which the moon is covered over [mithkaseh]? You must say that this is New Year;<span class="x" onmousemove="('comment',' The only feast which takes place when the moon is hidden.');"><sup>1</sup></span> and it is written [in this connection], For it is a statute for Israel, an ordinance for the God of Jacob.<span class="x" onmousemove="('comment',' Ibid. 5.');"><sup>2</sup></span>
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