The Gemara questions whether Chanukah or Rosh Chodesh are mentioned in Birchas Hamzon, but both days are certainly mentioned during Tefillah. However, there seems to be a discrepancy between them; if one omits Rosh Chodesh (Yaaleh veyavo) during Tefillah he need to repeat, but if he omits Chanukah (Al hanissim) he doesn’t – why?
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